Three-dimensional printing equipment and three-dimensional printing method

Abstract

The invention provides a three-dimensional printing method and three-dimensional printing equipment. The three-dimensional printing method comprises the steps that a first material is supplied to a bearing area of a light-permeable material containing mechanism of the three-dimensional printing equipment through a first channel of a material supply mechanism of the three-dimensional printing equipment; a second material different from the first material is supplied to the bearing area of the material containing mechanism through a second channel of the material supply mechanism; a forming platform mechanism of the three-dimensional printing equipment is moved, so that the forming platform mechanism makes contact with the first material and the second material in the bearing area; light rays are projected to the bearing area through an optical mechanism of the three-dimensional printing equipment, so that the first material and the second material are cured, and a curing layer adhering to the forming platform mechanism is formed; and the forming platform mechanism is moved away from the material containing mechanism, so that the curing layer is separated from the material containing mechanism.

Description

[0001] This application is a divisional application of the invention application with the application number 202310038195.8, the application date of January 10, 2023, and the invention name of "Three-dimensional printing device and three-dimensional printing method". TECHNICAL FIELD

[0002] The present application relates to the technical field of three-dimensional forming equipment, in particular to a three-dimensional printing device and a three-dimensional printing method. BACKGROUND

[0003] 3D printing technology is a technology that manufactures three-dimensional entities through 3D printing equipment in a layer-by-layer manner according to three-dimensional model data of an object. The 3D printing technology can overcome the special structure obstacles that cannot be realized by the current traditional mechanical processing, and realize the simple production of any complex structure parts. The existing light-curing printing technology is divided into three types: laser stereoscopic printing technology SLA (laser point light source curing), DLP (projector face light source curing), and LCD (liquid crystal face light curing).

[0004] At present, the application field of light-curing 3D printing technology is becoming more and more extensive, especially the light-curing technology, which has a wide application in the fields of molds, customized goods, medical jigs, dentistry, hand-made, prostheses, etc. due to its high forming precision. The light-curing 3D printing technology usually prints layer by layer in a layered slicing processing manner when manufacturing a model. The light-curing material between the printing reference surface and the model is cured to form a patterned curing layer. The above steps are repeated to form a printed structure accumulated by patterned curing layers on the component platform. The light-curing printers of the related technology can mostly only print parts of a single printing material, and there are very few light-curing machines that can print parts of multiple printing materials.

[0005] At home and abroad, the existing color 3D printing technology mostly adopts the non-discriminatory light-curing technology of inkjet sinking, that is, after the printing material is sprayed out through a linear nozzle, the light source follows the nozzle to non-discriminately expose and polymerize and cure all the sprayed resins on the forming platform / forming carrier. For example, in some related technologies, multiple nozzles are arranged on one side of the tank to spray different colored resins into the tank for printing a colored model. However, this printing method simply sprays different colored resins into the tank from one side through the nozzle. Since the resin has a high viscosity, it is difficult to ensure the flow leveling of the resin in the tank. The printing precision seriously depends on the liquid spraying precision of the nozzle, which affects the printing quality. SUMMARY

[0006] The purpose of the present application includes providing a three-dimensional printing device and a three-dimensional printing method, which can print parts with multiple printing materials.

[0007] The embodiments of the present application can be implemented as follows:

[0008] In a first aspect, the present application provides a three-dimensional printing device, comprising a material containing mechanism, a material supplying mechanism, a driving mechanism, an optical mechanism and a forming platform mechanism, wherein the material containing mechanism is light-transmissive and has a carrying area configured to carry printing materials; the material supplying mechanism has a material supplying assembly configured to quantitatively supply multiple types of printing materials; the driving mechanism is configured to realize relative movement between the carrying area and the material supplying assembly, so that the material supplying mechanism quantitatively supplies a preset type of printing material at a preset position of the material containing mechanism; the optical mechanism is configured to project exposure light on the printing materials in the carrying area, so that the printing materials are cured by a photo-curing reaction to form a printing model; and the forming platform mechanism is configured to adhere a cured layer formed by the cured printing materials layer by layer and separate the cured layer from the carrying area of the material containing mechanism.

[0009] In a second aspect, the present application provides a three-dimensional printing method applied to the three-dimensional printing device, comprising: obtaining a three-dimensional model, dividing the three-dimensional model into multiple slice layers, generating a corresponding printing strategy for each slice layer, the printing strategy comprising at least one of relative movement information between the carrying area and the material supplying assembly, material type of the printing materials supplied by the material supplying mechanism and projection information of the optical mechanism; supplying the printing materials to the carrying area of the material containing mechanism according to the printing strategy, wherein the material type corresponding to at least part of the slice layers is two or more; forming a cured layer after the printing materials are exposed and cured by the optical mechanism according to the projection information; and controlling the forming platform mechanism to separate the cured layer.

[0010] The beneficial effects of the embodiments of the present application include:

[0011] The three-dimensional printing device provided by the present application can realize relative movement between the material supplying assembly of the material supplying mechanism and the carrying area of the forming platform under the action of the driving mechanism, so that the material supplying assembly can be located at any position of the carrying area to realize supply of the printing materials at any position of the carrying area. The material supplying mechanism can supply multiple types of printing materials to the carrying area through the material supplying assembly, so that the required type of printing materials can be supplied at different positions of the carrying area as needed, single-layer printing of multiple materials can be realized to avoid the risk of mixing materials, color printing can be realized without the need for later coloring, printing of different material performance requirements can also be realized; and the printing quality is better. The three-dimensional printing device provided by the present application can also realize the three-dimensional printing method described above, so it also has the beneficial effects of improving work efficiency and reducing labor cost.

[0012] The three-dimensional printing method provided in the application realizes printing of multiple materials in a single layer to avoid mixing risks, can realize color printing, does not need to be colored later, and can realize printing of different material performance requirements; the light curing technology in the projection mode is used to cure and print the edges of the projection profile directly using the projection surface, so that the edge precision of the printed part depends on the projection precision of the optical mechanism, and the printing precision is higher compared with inkjet printing. In addition, compared with the upper projection printing, the lower projection printing is preferably used, and the lower projection printing needs less support than the upper projection sinking printing, and is more material-saving. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0015] Figure 1 The structural schematic diagram of the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0016] Figure 2 The partial structural schematic diagram of the leveling assembly as a leveling roller assembly in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0017] Figure 3 The working principle schematic diagram of the leveling assembly as a leveling roller assembly in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0018] Figure 4 The partial structural schematic diagram of the leveling assembly as a doctor blade assembly in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0019] Figure 5 The working principle schematic diagram of the leveling assembly as a doctor blade assembly in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0020] Figure 6 The structural schematic diagram of the doctor blade assembly in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0021] Figure 7 The structural schematic diagram of the wiping assembly in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0022] Figure 8 The structural schematic diagram of a material containing mechanism in the three-dimensional printing device provided in the embodiments of the present application is shown in the figure.

[0023] Figure 9 A structural schematic diagram of a three-dimensional printing device of an RGB color system provided by an embodiment of the present application is shown in FIG. 1.

[0024] Figure 10 A structural schematic diagram of a three-dimensional printing device of a CMYK color system provided by an embodiment of the present application is shown in FIG. 2.

[0025] Figure 11 A structural schematic diagram of a material containing mechanism in a three-dimensional printing device provided by an embodiment of the present application is shown in FIG. 3.

[0026] Figure 12 A structural schematic diagram of a material containing mechanism in a three-dimensional printing device provided by an embodiment of the present application is shown in FIG. 4.

[0027] Figure 13 A structural schematic diagram of a material containing mechanism in a three-dimensional printing device provided by an embodiment of the present application is shown in FIG. 5.

[0028] Figure 14 A structural schematic diagram of a material containing mechanism in a three-dimensional printing device provided by an embodiment of the present application is shown in FIG. 6.

[0029] Figure 15 A structural schematic diagram of a three-dimensional printing device provided by an embodiment of the present application is shown in FIG. 7.

[0030] Figure 16 A structural schematic diagram of a three-dimensional printing device provided by an embodiment of the present application is shown in FIG. 8.

[0031] Figure 17 A flow schematic diagram of a three-dimensional printing method provided by an embodiment of the present application is shown in FIG. 9.

[0032] Figure 18 A schematic diagram of a three-dimensional printing model provided by an embodiment of the present application is shown in FIG. 10.

[0033] Figure 19 Another schematic diagram of a three-dimensional printing model provided by an embodiment of the present application is shown in FIG. 11.

[0034] Figure 20 Still another schematic diagram of a three-dimensional printing model provided by an embodiment of the present application is shown in FIG. 12.

[0035] Figure 21 A schematic diagram of three-dimensional printing model slicing layer lattice provided by an embodiment of the present application is shown in FIG. 13.

[0036] 100, material containing mechanism; 101, transparent film; 102, upper film frame; 103, lower film frame; 104, upper transparent plate; 105, lower transparent plate; 106, second cavity; 107, gas supply assembly; 108, bearing area; 109, micropore; 110, medium layer;

[0037] 200, feeding mechanism; 201, feeding assembly; 202, pipeline; 203, storage assembly;

[0038] 300, driving mechanism; 301, first driving assembly; 3011, second lifting assembly; 3012, translation assembly;

[0039] 400, optical mechanism;

[0040] 500, forming platform mechanism; 501, first lifting assembly; 502, forming platform; 5021, forming surface;

[0041] 600, cleaning mechanism; 601, waste storage device; 602, wiping assembly; 6021, fixed part; 6022, elastic member; 6023, movable part; 6024, incoming material roller; 6025, material receiving roller; 6026, lint-free cloth.

[0042] 700, leveling mechanism; 701, leveling assembly;

[0043] 800, scraper assembly; 801, scraper holder; 802, scraper mounting bracket; 803, scraper body;

[0044] 900, printed piece; 901, solid structure; 9011, contour; 9012, filling part; 9013, outer surface layer; 9014, inner layer; 902, sacrificial structure; 9021, bottom plate; 9022, support part; 904, sub-region; 905, gap;

[0045] 1000, printing material. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0048] It should be noted that: the features in the embodiments of the present application can be combined with each other without conflict.

[0049] 3D printing technology is to manufacture a three-dimensional entity through a three-dimensional printing device in a layer-by-layer manner according to three-dimensional model data of an object. The 3D printing technology can overcome the special structure barrier that cannot be realized by the current traditional mechanical processing, and realize the simple production of components with any complex structure. The existing 3D printing technologies include stereolithography (SLA), digital light processing forming (DLP) and liquid crystal display technology (LCD), fused deposition modeling (FDM), polyjet, multi-jet printing (MJP), multi-jet fusion (MJF), selective laser sintering (SLS) and the like.

[0050] In some related technologies, a liquid photopolymer layer is sprayed onto a build tray by a nozzle, and then the entire build tray is irradiated with ultraviolet light to solidify the liquid photopolymer layer sprayed on the tray. The build tray is lowered by one molding layer thickness, the nozzle continues to spray the liquid photopolymer to print and solidify the next layer, and the process is repeated to complete the 3D printing of the model. This printing method is to expose and polymerize the liquid photopolymer layer on the build tray by the light source following the nozzle without distinction after the printing material is sprayed by the linear nozzle. The printing precision and printing quality depend on the size accuracy of the nozzle, and the smaller the size of the nozzle, the fewer the printing materials that can be adapted, thereby resulting in low printing precision, poor printing quality and single selection of printing materials.

[0051] In some related technologies, after the light-cured 3D printer prints a single color structure, the model is colored by a post-coloring method. This printing method is very simple and has complicated steps. In addition, the residual materials such as un-solidified resin or residue on the upper layer in the printing process will affect the printing of the next layer, resulting in poor printing quality and poor effect.

[0052] In some related technologies, a printing platform is moved between different material holding mechanisms by a Z-axis translation mechanism that can drive the movement of the printing platform, so that a single printing piece can be printed with multiple materials. However, the actual each layer is a single color, and single-layer multi-color printing cannot be realized. In addition, there is a risk of contamination during the printing process.

[0053] In some related technologies, a lattice fence is arranged on a release film, and then a resin dispenser is arranged. The computer controls which lattice fence needs which color of resin in each layer of the drawing, controls the resin dispenser to inject the resin into the corresponding lattice area, and then exposes and solidifies a layer. The lattice fence is washed clean by a cleaning part, dried, and the next layer of printing is performed. The process is repeated to complete the color printing. However, the printing piece needs to be post-processed after each layer of printing to stabilize the color of the printed layer, which is complicated and has low printing efficiency.

[0054] In some related technologies, the three-dimensional model printed by the three-dimensional printing equipment has a support part, which supports the main part during the printing process. After the three-dimensional model is printed, the support part needs to be removed. However, in the related technologies, the support part and the main part are made of the same printing material. The process of removing the support part is relatively laborious and difficult to remove cleanly.

[0055] To address at least one of the deficiencies in the aforementioned related art, the present invention provides a 3D printing device and method that can supply two or more printing materials during single-layer printing, configuring different printing materials in different areas of a 3D model to meet production needs, thereby improving efficiency and reducing labor costs. To facilitate understanding of the 3D printing method provided in the present invention, the following first introduces the 3D printing device provided in the present invention.

[0056] like Figure 1 As shown, the main structure of the 3D printing device of the embodiment of the present application includes a material holding mechanism 100, a feeding mechanism 200, a driving mechanism 300, an optical mechanism 400, and a forming platform mechanism 500. The material holding mechanism 100 is light-transmissive and has a carrying area 108 configured to hold printing materials; the feeding mechanism 200 has a feeding assembly 201 configured to quantitatively supply multiple types of printing materials; the driving mechanism 300 is configured to achieve relative movement between the carrying area 108 and the feeding assembly 201, so that the feeding mechanism 200 quantitatively supplies a preset type of printing material at a preset position of the material holding mechanism 100; the optical mechanism 400 is configured to project and expose the printing material in the carrying area 108, causing the printing material to undergo a photocuring reaction to form a printed model; and the forming platform mechanism 500 is configured to adhere the cured printing material layer by layer and solidify the layers from the carrying area of ​​the material holding mechanism.

[0057] Specifically, the forming platform mechanism 500 includes a first lifting assembly 501 and a forming platform 502. The forming platform 502 has a forming surface 5021, which is used for the printed part to be attached. The forming platform 502 moves back and forth on a path close to or away from the material holding mechanism 100. The first lifting assembly 501 is used to drive the forming platform 502 to rise and fall so that it approaches or moves away from the material holding mechanism 100. The forming surface 5021 of the forming platform 502 is generally the surface of the forming platform 502 facing the material holding mechanism 100, so as to be opposite to the bearing area 108 of the material holding mechanism 100. During the printing process, the printed part can be solidified layer by layer on the forming surface 5021, and as the printed part is formed layer by layer, the forming platform 502 gradually rises, thereby realizing the layer-by-layer separation and stacking of the printed layers, and finally completing the printing of the printed model.

[0058] Specifically, the material containing mechanism 100 is made of transparent material, the bearing area 108 of the material containing mechanism 100 is used to bear the printing material, the optical mechanism 400 can be arranged below or above the material containing mechanism 100 corresponding to the bearing area 108, preferably arranged below the bearing area 108; the bearing area 108 and the forming platform 502 are correspondingly located above or below the optical structure, preferably above the optical mechanism; the optical mechanism 400 can emit light beams, the light beams pass through the transparent area of the material containing mechanism 100 to the bearing area 108, which can make the printing material in the bearing area 108 solidify. When 3D printing is performed, the forming platform 502 is gradually close to the bearing area 108 of the material containing mechanism 100 under the driving of the first lifting assembly 501, and the forming surface 5021 is attached to the upper surface of the printing material in the bearing area 108, the light of the optical mechanism 400 passes through the light-transmitting area and irradiates into the printing material in the bearing area 108, so that the printing material between the material containing mechanism 100 and the forming surface 5021 solidifies and is solidified on the forming surface 5021 of the forming platform 502, or solidified on the previous layer of printing material which has been solidified on the forming surface 5021, and is stacked layer by layer, thereby realizing the printing of the model.

[0059] It should be noted that the solidification mode of the printing material by the optical mechanism 400 can be applied to various light solidification principles in the prior art, the optical system of the optical mechanism 400 includes but is not limited to any one of DLP projection system, Micro-LED display system, LCOS optical system, LCD display system and laser galvanometer scanning system, and those skilled in the art can reasonably select according to the needs.

[0060] In the above-mentioned embodiments, under the action of the driving mechanism 300, the feeding assembly 201 of the feeding mechanism 200 and the bearing area 108 of the forming platform 502 can move relatively, so that the feeding assembly 201 can be located at any position of the bearing area 108 to realize the supply of the printing material at any position of the bearing area 108. The feeding mechanism 200 can supply various types of printing materials to the bearing area 108 through the feeding assembly 201, so that the required type of printing material can be supplied at different positions of the bearing area 108 as needed. That is, the feeding assembly 201 can supply at least two different types of printing materials, which can realize color printing and printing with different performance requirements. For example, when color printing is required, the color of the printing material supplied at different positions can be adjusted and controlled through a color control scheme to realize color printing. The three-dimensional printing equipment of the above-mentioned embodiments of the present application can supply printing materials with the required color at the corresponding positions of the bearing area 108 during the printing process according to the color requirements of the product, and directly obtain the required printed part after printing, which realizes the function of directly printing color, and the steps are simple, the printing quality is better, and the color is more realistic, compared with the technical scheme of coloring the model through the method of coloring after printing a single color structure by the light-curing 3D printer in the related art.

[0061] Compared with the technical scheme of setting multiple feeding mechanisms and moving the printing platform between different feeding mechanisms to realize that one printed part can be printed with multiple materials in the related art, the three-dimensional printing equipment of the above-mentioned embodiments of the present application can realize single-layer multi-material printing, and can reduce the risk of contamination during the printing process. Moreover, the light-curing technology in the projection mode directly uses the projection profile of the projection surface to cure the edge of the printed part, so the edge precision of the printed part depends on the projection precision of the optical mechanism, and the printing precision is higher than that of inkjet printing. Since the printing precision is not dependent on the nozzle size precision of the nozzle, the requirement for the nozzle size of the nozzle is not too high, as long as the nozzle can jet a certain amount of printing material according to the technical scheme, in other words, the size of the nozzle can be larger than that of the nozzle of the inkjet printing head, so that more printing materials with different viscosities can be adapted, thereby realizing printing with more colors or performance requirements. In addition, compared with the upper projection printing, the lower projection printing needs less support than the upper projection sinking printing, which is more material-saving.

[0062] In some embodiments, the three-dimensional printing device further comprises a leveling mechanism 700 configured to keep the thickness of the printing material supplied by the feeding mechanism 200 on the material holding mechanism 100 within a preset range. The leveling mechanism 700 can keep the thickness of the printing material supplied by the feeding assembly 201 on the bearing area 108 uniform, so that the printing process is kept fine and accurate, and the printing precision is improved. It should be noted that if the printing material supplied by the feeding assembly 201 on the bearing area is uniform and quantitative enough, the leveling by the leveling mechanism 700 is not needed.

[0063] It should be noted that the relative position of the leveling mechanism 700 and the material holding mechanism 100 in the vertical direction needs to change with the change of the relative position between the feeding assembly 201 and the material holding mechanism 100, so as to prevent interference between the leveling mechanism 700 and the feeding assembly 201. Therefore, the relative position relationship between the leveling mechanism 700 and the bearing area of the material holding mechanism 100 can also be adjusted by the driving mechanism 300, so that the leveling mechanism 700 and the feeding assembly 201 can simultaneously move relative to the material holding mechanism 100 in the vertical direction and the horizontal direction. Of course, a separate driving structure can also be selected to control the relative movement between the leveling mechanism 700 and the bearing area 108, but from the perspective of simplifying the overall structure and space utilization, it is preferred to adjust the relative movement between the leveling mechanism 700 and the bearing area 108 by the aforementioned driving mechanism 300.

[0064] Optionally, the leveling mechanism 700 comprises a leveling assembly 701, which is mainly used to keep the thickness of the printing material supplied by the feeding mechanism 200 on the material holding mechanism 100 within a preset range. The leveling assembly 701 includes but is not limited to any one of a doctor blade assembly 800, a leveling roller assembly, a roller assembly, and a push rod assembly, and of course can also be any other device that can achieve leveling.

[0065] In some embodiments, as shown in Figure 2 and 3 The leveling assembly 701 can comprise at least one leveling roller assembly, which is used to level the unsolidified printing material supplied to the bearing area of the material holding mechanism 100, so as to ensure the dimensional accuracy of the material layer in the vertical direction. Specifically, the leveling roller assembly can be a cylindrical component that can rotate about its installation axis, or a conical component that can rotate about its installation axis, etc. The leveling roller assembly rotates at a high speed during leveling and contacts the unsolidified printing material 1000 on the material holding mechanism 100, so as to remove the printing material higher than the preset thickness on the unsolidified material layer and ensure the dimensional accuracy of the material layer in the vertical direction. Figure 3In some embodiments, the leveling roller assembly is designed as a conical structure, which is suitable for the case that the feeding assembly 201 remains stationary during the rotation printing process, the landing point of the printing material is different along the radial position, and the relative linear speed is also different. In this case, the demand for the leveling ability of the leveling assembly 701 is also different. The taper of the conical structure of the leveling roller can realize linear leveling ability to match the linear speed change in the rotation printing process.

[0066] In some embodiments, the leveling roller is designed as a conical structure, which is suitable for the case that the feeding assembly 201 remains stationary during the rotation printing process, the landing point of the printing material is different along the radial position, and the relative linear speed is also different. In this case, the demand for the leveling ability of the leveling assembly 701 is also different. The taper of the conical structure of the leveling roller can realize linear leveling ability to match the linear speed change in the rotation printing process.

[0067] In some embodiments, as shown in Figure 4 and 5 The leveling assembly 701 can include at least one scraper assembly 800. As shown in Figure 6 The scraper assembly 800 includes a scraper holder 801, a scraper mounting bracket 802, and a scraper body 803. The scraper holder 801 and the scraper mounting bracket 802 are connected by an elastic connection assembly for connection and buffering. The scraper body 803 is arranged on the scraper holder 801, and the scraper mounting bracket 802 can be connected with the driving mechanism 300. The scraper assembly 800 moves relative to the corresponding position of the bearing area 108 of the material containing mechanism 100 through the driving mechanism 300. The movement direction of the relative movement is parallel to the surface of the material containing mechanism 100, that is, the distance between the bottom end of the scraper body 803 and the surface of the printing material remains almost unchanged during the relative movement. The direction of the relative movement can include relative translation along the length direction of the material containing mechanism 100 or relative translation along the width direction of the material containing mechanism 100. The purpose of the above relative movement is to solve the problem of uneven distribution of the printing material supplied by the feeding assembly 201 on the material containing mechanism 100 due to poor flowability of the printing material, thereby affecting the printing quality. In Figure 5In the middle, the doctor blade assembly moves from right to left relative to the transparent film 101, and after the leveling process of the doctor blade assembly 800, the printing material 1000 on the back side of the doctor blade assembly 800 is leveled to the same thickness. The doctor blade assembly 800 can overcome the problem of poor flowability of the printing material 1000, so that the printing material covers the bearing area 108 of the material containing mechanism 100, and the printing material thickness of the single layer printing layer is leveled.

[0068] In the production process, it is found that the leveling assembly 701 may bring the printing material in one area to another area during work, which may cause mixing in the latter area, resulting in contamination of the printing material and affecting the printing accuracy and effect. Taking the leveling assembly 701 as the doctor blade assembly 800 as an example, during the feeding process of the feeding assembly 201 from right to left, assuming that the printing material in the bearing area 108 is divided into multiple color zones, when the doctor blade body 803 of the doctor blade assembly 800 passes through the first color zone and scrapes off the excess waste, the waste in the first color zone will be pushed to the second color zone, resulting in mixing and color bleeding. Based on this, the leveling mechanism 700 includes a waste collecting assembly in addition to the leveling assembly 701, wherein the waste collecting assembly is configured to collect the waste removed by the leveling assembly 701 during the work of the leveling assembly 701, and to ensure that no waste enters the material containing mechanism 100 again.

[0069] Continuing to take the leveling assembly 701 as the doctor blade assembly 800 as an example, during the feeding process of the feeding assembly 201 from right to left, assuming that the printing material in the bearing area 108 is divided into multiple color zones, when the doctor blade body 803 of the doctor blade assembly 800 passes through the first color zone and scrapes off the excess waste, the waste scraped off by the doctor blade body 803 is collected by the waste collecting assembly to prevent the waste from entering other color zones and affecting the color accuracy of other color zones.

[0070] The specific form of the waste collecting assembly includes but is not limited to a negative pressure suction structure and a wiping structure, as long as it can collect the waste removed by the leveling assembly 701 in time. The faster the waste collecting assembly responds, the less mixing and color bleeding between different areas.

[0071] In some embodiments, the leveling mechanism 700 can be arranged at any position of the material containing mechanism 100 as long as it can level the printing material to the preset thickness. The leveling mechanism 700 can be arranged in multiple, and multiple leveling mechanisms 700 work at the same time, thereby improving the work efficiency.

[0072] In some embodiments, as Figure 1As shown, the three-dimensional printing device further comprises a cleaning mechanism 600, which is configured to remove the printing material remaining on the material holding mechanism 100 after the forming platform mechanism separates the solidified layer, and in particular, to remove the printing material remaining on the bearing area 108 after the forming platform mechanism separates the solidified layer. The removal mechanism can remove the remaining printing material after the forming platform mechanism separates the solidified layer each time, or can remove the printing material after the forming platform mechanism separates the solidified layer at specific times. For example, when printing the sacrificial mechanism and the base structure, the remaining printing material can not be removed because it does not affect the printing quality of the solid part, thereby improving the printing efficiency. When printing the same color or performance material, the remaining printing material can not be removed to avoid color mixing and affect the printing quality. The specific configuration can be reasonably set according to the needs of the technical solutions in the art. In this embodiment, the mechanisms of the three-dimensional printing device cooperate with each other to form the printing material into the required printed part 900. The cleaning mechanism 600 can avoid the situation that the remaining material such as the upper layer of the uncured resin or residue generated during the printing process affects the printing of the next layer.

[0073] In some embodiments, the cleaning mechanism 600 can be a scraper assembly 800, a high-pressure air gun, a wiping assembly 602, or any structure that can achieve the cleaning of the material holding mechanism 100.

[0074] In some embodiments, the cleaning mechanism 600 can be an independent control system, or can share a control system with the nozzle assembly / leveling mechanism. It can move independently, or can move together with the nozzle assembly / leveling mechanism. For example, after the nozzle assembly finishes spraying the printing material, the leveling mechanism levels the printing material, and after the forming platform mechanism descends to complete the exposure and solidification to separate the solidified layer, the cleaning mechanism moves together with the nozzle assembly / leveling mechanism to clean and return to the original position. Alternatively, the cleaning mechanism first cleans the remaining resin on the bearing area, and then the nozzle assembly / leveling mechanism sprays and levels the printing material.

[0075] Optionally, the cleaning mechanism 600 is a high-pressure air gun, which can blow away the uncured printing material or residue on the material holding mechanism 100 after each solidification. Correspondingly, the side of the material holding mechanism 100 where the high-pressure air gun is arranged is provided with a blowout port, and the outlet of the high-pressure air gun is opposite to the blowout port, for blowing away the uncured printing material or residue.

[0076] Optionally, the cleaning mechanism 600 is a scraper assembly 800. The scraper assembly 800 can be driven by the drive mechanism 300 to move relative to the support area 108, thereby scraping excess printed material and residue from the material receiving mechanism 100 after the printed material solidifies. The specific structure of the scraper assembly 800 is similar to the description of the scraper assembly 800 in the leveling assembly 701, and will not be repeated here. The structures and operating principles of the two are the same, with the only difference being that when the scraper assembly 800 functions as the leveling assembly 701, it is used to scrape off the portion of the printed material that exceeds a predetermined thickness, while when the scraper assembly 800 functions as the cleaning mechanism 600, it is used to scrape off all uncured printed material and residue from the material receiving mechanism 100.

[0077] Alternatively, as Figure 7 As shown, the cleaning mechanism 600 is a wiping assembly 602, which is located above the material receiving mechanism 100. The wiping assembly 602 includes a fixed portion 6021, an elastic member 6022, a movable portion 6023, a feed roller 6024, and a receiving roller 6025. The elastic member 6022 ensures that the movable portion 6023 always tends to move toward the material receiving mechanism 100. The feed roller 6024 and the receiving roller 6025 are located on either side of the movable portion 6023 and are both used to wrap a dust-free cloth 6026. During operation, the dust-free cloth 6026 passes around the lower end of the movable portion. The drive mechanism can achieve relative movement between the wiping assembly 602 and the material receiving mechanism 100, so that the supporting area 108 is directly below the movable portion 6023. The dust-free cloth 6026 on the movable portion 6023 contacts the residual material on the supporting area 108, and the dust-free cloth 6026 completes the absorption and wiping of the residual material. Under the elastic force of the elastic member 6022, the movable portion 6023 will press against the material holding mechanism 100. The elastic member 6022 provides elastic force to ensure close contact between the dust-free cloth 6026 and the material holding mechanism 100. At the same time, the elastic member 6022 can retain space for further deformation to achieve flexible wiping. On the basis of completing the wiping, the bearing area 108 is protected to avoid being crushed during wiping. In addition, the preferred dust-free cloth can be a disposable consumable, which can reduce the cleaning and maintenance of the cleaning mechanism and improve printing efficiency. Furthermore, the incoming material roller 6024 is used to wind the incoming material of the dust-free cloth 6026, and the receiving material roller 6025 is used to collect the dust-free cloth 6026 after wiping. The receiving material roller 6025 is used to provide driving force to drive the movement of the dust-free cloth 6026. The dust-free cloth 6026 in the incoming material roller 6024 is recovered by the receiving material roller 6025 after passing through the movable portion 6023. Further, as Figure 8As shown, the cleaning mechanism 600 further comprises a turnover assembly for overturning the bearing area 108 of the material containing mechanism 100, so as to overturn the state of the printing material above the bearing area 108 to the state of the printing material below the bearing area 108, so as to make the unsolidified printing material and residues naturally fall under the action of gravity, and further assist the scraping action of the scraper assembly 800 or the blowing action of the high-pressure air gun, so as to more easily remove the unsolidified printing material and residues.

[0078] In some embodiments, as shown in Figure 1 As shown, the cleaning mechanism 600 further comprises a waste collecting device 601 for collecting the unsolidified printing material or residues removed from the material containing mechanism 100 by the cleaning mechanism 600. The waste collecting device 601 can be various containers that can be used for collection.

[0079] In some embodiments, as shown in Figure 9 and 10 As shown, the feeding mechanism 200 is used to replenish the supply of printing material to the bearing area 108 of the material containing mechanism 100, and the feeding mechanism 200 at least comprises a storage assembly 203, a pump body, a pipeline 202 and a feeding assembly 201. The storage assembly 203 is used to store printing material, and the storage assembly 203 comprises a plurality of storage portions for respectively storing different types of printing material; the pump body is used to provide driving force to pump the printing material in the storage assembly 203 to the feeding assembly 201 through the pipeline 202, and in addition, the pump body can also be used to control the supply amount of the printing material; and the feeding assembly 201 is used to supply the printing material to a designated position of the material containing mechanism 100. The feeding assembly 201 is preferably a nozzle assembly, which can comprise one or several nozzles, and the nozzle holes of the nozzles are connected to the storage portions through the pipeline, so that the nozzle assembly can be used to supply multiple types of printing material. Specifically, one nozzle can correspond to one or more feeding channels. For example, one nozzle can be designed with only one feeding channel, and can be used to supply one type of printing material; for another example, one nozzle can be provided with two, four or eight feeding channels, each of which can be used to supply one type of printing material, and of course, one type of printing material can also be supplied through multiple feeding channels.

[0080] For example, multiple feeding channels provided by the nozzle assembly can be used to spray different colors of printing material to the bearing area 108 of the material containing mechanism 100, so as to print a colored model, thereby reducing the post-printing dyeing process. Different colors of printing material are stored in different storage portions of the storage assembly, different feeding channels are in communication with the storage portions storing different colors of printing material, and the pump body is used to spray different colors of printing material through different feeding channels of the nozzle assembly, so as to spray the printing material on the bearing area 108 of the material containing mechanism 100 during the printing process.

[0081] For specific color management, the amount of different types of printing materials can be controlled by means of software, and the printing materials can be formulated into any color, so that the color can be changed at any time during the printing process, and gradient color printing, color interlaced printing or transparent and translucent color interlaced printing can be achieved, which can better meet the diversified market demand. Alternatively, the color control method of the printing material can be generated by digitally combining other color model materials used by the printer, for example, cyan, magenta and yellow (CMY) printing materials can be combined as a group, and the RGB color system as shown in Figure 9 and the conversion of the RGB color system to the CMYK color system as shown in Figure 10 The printing materials corresponding to each primary color in each color system are stored in different storage parts, and the printing materials corresponding to each primary color are supplied by the nozzle head assembly and combined, so that various colors in the color spectrum corresponding to each color system can be obtained. In addition, color management can be performed by changing the color components, the size of the droplets of the printing materials, the color sequence of the printing materials and the stacking method of the printing materials, and those skilled in the art can make flexible selection, which will not be described here.

[0082] In some embodiments, the three-dimensional printing device further comprises a calibration system, the calibration system comprising a camera device, a calibration device and a calibration plate, the calibration system being used to calibrate at least one of the optical mechanism 400 and the feeding assembly 201, thereby improving the accuracy of the printing process.

[0083] Before printing, the optical mechanism 400 can be optically calibrated. Specifically, the calibration plate of the calibration system is used to be placed on the bearing area 108 of the material holding mechanism 100 of the three-dimensional printing device, and the calibration plate is formed with calibration points distributed at a preset distance; the optical mechanism 400 of the optical mechanism 400 is arranged below the material holding mechanism 100, and is used to project actual projection points distributed at a preset distance to the bearing area 108 of the material holding mechanism 100; the camera device is used to shoot the calibration points on the calibration plate and the actual projection points on the bearing area 108 of the material holding mechanism 100; the calibration device is in communication connection with the camera device, and the calibration device generates correction information according to the offset between the calibration points and the actual projection points, which is used to guide the optical mechanism 400 to correct the position until the relative position of the calibration points and the actual projection points obtained is consistent, which is preferably coincident, and of course the relative position can also be not coincident. The preset distance distribution can be matrix distribution, linear distribution, star array distribution or any other distribution mode that can determine the positional relationship between the calibration plate, the projection points and the photographed points.

[0084] After the calibration of the optical mechanism 400 is completed, the supply assembly 201 can be calibrated to calibrate the relative position of the projection of the optical mechanism 400 and the movement of the supply assembly. In the present embodiment, the supply assembly is taken as an example of the print head assembly. Specifically, the print head of the print head assembly is controlled to spray the print material to form a droplet point on the bearing area 108, and the droplet point is formed in the projection area formed after the projection of the optical mechanism 400. Then, the coordinates of the droplet point are captured by the camera device, and compared with the coordinates of the calibration point recorded after the calibration of the optical mechanism 400. The position of the print head is adjusted to calibrate the print head. One print head assembly usually includes multiple rows of print heads, and the relative positions of the multiple rows of print heads are fixed. Therefore, the print head assembly only needs to be calibrated once. If there are multiple print heads, one of the print heads is calibrated first, and the other print heads are adjusted based on the calibrated print head to keep parallel and fixed.

[0085] In some embodiments, the supply mechanism 100 includes at least one transparent film 101, and the transparent film 101 has a bearing area 108 for bearing the print material. In order to reduce the adhesion between the cured layer and the supply mechanism 100 and make them easy to separate, the transparent film 101 is preferably a release film. The release film includes but is not limited to any one of a fluoropolymer film, a polydimethylsiloxane (PDMS) film, and a polymethylpentene (PMP) film. The fluoropolymer film includes but is not limited to at least one of a FEP film, an nFEP film, a PTFE film, an ETFE film, a PFA film, a PVDF film, a PVF film, and a PCTFE film. In another embodiment, the transparent film 101 can also be a composite release film formed by laminating a base layer and a plastic layer. The material of the plastic layer can be selected from, but is not limited to, one or more of polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), thermoplastic polyurethane (TPU), polyamide or nylon (PA), polyimide (PI), polypropylene (PP), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polystyrene (PS), polybutylene (PB), polyoxymethylene (POM), polycarbonate (PC), polysulfone (PSU), polyphenylene oxide (PPO), polyvinyl alcohol (PVA), acrylonitrile styrene (AS), acrylonitrile butadiene styrene (ABS), and fluororesin (FR), or a blend polymer, a block polymer, or an interpenetrating network polymer formed by polymerization of two or more of them.

[0086] In some embodiments, in order to fix the transparent film 101, a film covering method or a film stretching method can be selected for fixing.

[0087] Optionally, as Figure 12As shown, as an implementation of the film covering mode, the material containing mechanism includes a transparent film 101, a medium layer 110, and an upper transparent plate 104, the transparent film 101 is attached to the upper transparent plate 104 via the medium layer 110. Specifically, the transparent film 101 can be attached to the upper transparent plate 104 by electrostatic adsorption or adhesive paste. The medium layer 110 is usually a silica gel layer, glue, adhesive, etc. The upper transparent plate 104 is usually made of quartz, fused quartz, water white glass, or any other hard material that is substantially transparent to the wavelength used and has substantially good optical quality, and supports the transparent film 101 on the basis of light transmission.

[0088] Optionally, as shown, Figure 11 As an implementation of the film stretching mode, the material containing mechanism 100 includes a transparent film 101 and a film frame, the film frame includes an upper film frame 102 and a lower film frame 103, and the transparent film 101 is tightly fixed between the upper film frame 102 and the lower film frame 103. As shown, the upper film frame 102 and the lower film frame 103 are detachably connected, the transparent film 101 is fixed between the upper film frame 102 and the lower film frame 103, and the transparent film 101 can be stretched tightly by the upper film frame 102 and the lower film frame 103. When it is necessary to replace the transparent film 101, the upper film frame 102 and the lower film frame 103 can be simply disassembled, and the transparent film 101 can be directly replaced.

[0089] Optionally, as an implementation of the film stretching mode, the material containing mechanism 100 includes a transparent film 101 and a film frame, the film frame only includes an upper film frame 102, and the transparent film 101 is stretched on the upper film frame. Specifically, the edges of the transparent film 101 are fixed on the upper film frame 102 after being stretched, and the transparent film 101 can be fixed on the upper film frame 102 by adhesive paste or hot pressing.

[0090] In the implementation of the film stretching mode, the transparent film 101 is prone to stress deformation during the operation of the leveling mechanism 700 or the cleaning mechanism 600. In order to improve the support of the transparent film 101, as shown in Figure 13 and 14 The material containing mechanism 100 further includes an upper transparent plate 104, which is arranged below the transparent film 101. The upper transparent plate 104 is usually made of quartz, fused quartz, water white glass, or any other hard material that is substantially transparent to the wavelength used and has substantially good optical quality, and supports the transparent film 101 on the basis of light transmission.

[0091] Preferably, a first cavity is formed between the upper transparent plate 104 and the transparent film 101, and a fluid is injected into the first cavity, so as to play a role of inhibiting polymerization and reducing separation force during the curing process of the printing material on the transparent film 101. The fluid includes, but is not limited to, at least one of an oxygen-rich liquid, an inert liquid, oxygen, air, and an oxygen-rich gas. Specifically, the gas is preferably oxygen, air, or an oxygen-rich gas, etc. The liquid is preferably an oxygen-rich liquid that is not permeable to the transparent film 101, and the polymerization inhibitor is preferably any one or a random combination of o-nitrophenol, hydroquinone, p-hydroxyanisole, p-phenylenediamine, p-tert-butylcatechol, and phenothiazine.

[0092] In some embodiments, a texture and micropores can also be provided on the transparent film 101, and a micropore 109 and other structures can be provided on the upper transparent plate 104, for improving the permeability of the fluid, thereby reducing the separation force and improving the printing efficiency. Specifically, for the cover film type material containing mechanism, the micropore 109 is preferably provided on the upper transparent plate 104, so that the fluid below the upper transparent plate 104 can permeate the upper transparent plate 104 and contact the transparent film 101.

[0093] In some embodiments, a polymerization inhibitor or an inert liquid is coated on the surface of the bearing area 108 of the transparent film 101, and the inert liquid includes, but is not limited to, liquid perfluorocarbon and fluorine oil. During the working process of the three-dimensional printing device, a layer of polymerization inhibitor or inert liquid can be supplied on the bearing area of the transparent film before the printing material is supplied, so that the polymerization inhibitor or inert liquid can change the separation process of the cured layer in the light curing printing process from solid-solid separation to solid-liquid separation, and effectively reduce the pulling force in the release process, thereby improving the printing speed and printing area. Moreover, the printing interface is in a liquid state, which can timely dissipate heat to ensure the material stability while printing at a high speed.

[0094] In some embodiments, as shown in FIG. 6, the bearing area 108 of the transparent film 101 is provided with a plurality of micropores 109, and the upper transparent plate 104 is provided with a plurality of micropores 109. Figure 13 and 14As shown, the material containing mechanism 100 includes a transparent film 101, a gas supply assembly 107, an upper transparent plate 104 and a lower transparent plate 105, the upper transparent plate 104 is located below the transparent film 101, the lower transparent plate 105 is located below the upper transparent plate 104, the second cavity 106 is formed between the lower transparent plate 105 and the transparent film 101, and the gas supply assembly 107 is configured to inject gas into the second cavity 106. The transparent film 101 can be fixed by the aforementioned stretching film method or the film covering method, the upper transparent plate 104 below the transparent film 101 is used to support the transparent film 101 to avoid deformation under stress, and the lower transparent plate 105 of the material containing mechanism 100 is used to form the second cavity 106 with the upper transparent plate 104, the second cavity 106 is used for inflation to reduce the separation force and improve the printing efficiency. Further, the transparent film 101 can be provided with texture and micropore structures, and the upper transparent plate 104 can be provided with texture and micropore 109 structures, which are used to improve the permeability of the fluid, thereby reducing the separation force and improving the printing efficiency.

[0095] In addition, for the film covering type material containing mechanism 100, microchannels can be formed on the surface of the transparent film 101 by using a photolithography process, and micropore structures can be formed on the upper transparent plate 104 to improve the permeability of the fluid and reduce the separation force.

[0096] In the present application, the driving mechanism 300 can generally include the following three implementation forms to achieve the relative movement between the material supply assembly 201 and the bearing area 108 of the forming platform mechanism 500.

[0097] In some embodiments, as shown in FIG. 6, the driving mechanism 300 can include a driving assembly 301 and a transmission assembly 302, the transmission assembly 302 is connected to the driving assembly 301 and the material supply assembly 201, and the driving assembly 301 is connected to the bearing area 108 of the forming platform mechanism 500. Figure 2 and 4As shown, the driving mechanism 300 comprises a first driving assembly 301 configured to drive the supply assembly 201 to move in space while the bearing area 108 of the holding mechanism 100 remains stationary in space. In this context, the initial position of the supply assembly 201 is on one side of the holding mechanism 100, and the leveling mechanism 700 is preferably mounted on the first driving assembly 301. Specifically, during the operation, the supply assembly 201 on one side of the holding mechanism 100 is moved above the bearing area 108 of the holding mechanism 100 under the action of the first driving assembly 301 to supply different types of printing materials to the bearing area 108 of the holding mechanism 100, and then the leveling mechanism 700 is driven by the first driving assembly 301 to level the printing materials to the thickness of a single layer of the printing layer. The supply assembly can also be back staggered to supply under the action of the first driving assembly 301. After the leveling mechanism 700 levels the printing materials to the thickness of a single layer, the supply assembly 201 and the leveling assembly 701 can be returned to the initial position under the action of the first driving assembly 301 to wait for the next supply and leveling operation of the printing layer. Specifically, the first driving assembly 301 can comprise a second lifting assembly 3011 and a translation assembly 3012, wherein the second lifting assembly 3011 is used to realize the lifting movement in the vertical direction, and the translation assembly 3012 is used to realize the two-dimensional movement in the horizontal direction. The movement in space can be realized by the second lifting assembly 3011 and the translation assembly 3012, and a rotation assembly can be added to increase a rotation degree of freedom and improve the flexibility of the movement in space if necessary. The driving mechanism 300 can be a push rod, a slide rail, a linear module, or a combination thereof.

[0098] In some embodiments, as Figure 15 and 16As shown, the driving mechanism 300 comprises a second driving assembly configured to drive the carrying area 108 of the material holding mechanism 100 to move in space, the feeding assembly 201 preferably remains stationary in space, the leveling mechanism 700 and the cleaning mechanism 600 also preferably remain stationary in space. In this context, the leveling mechanism 700 and the feeding assembly 201 are located on one side of the forming platform 502, and the cleaning mechanism 600 is located on the other side of the forming platform 502. Specifically, in the working process, the carrying area 108 is driven by the first driving assembly 301 to the lower side of the feeding assembly 201, the feeding assembly 201 supplies different types of printing materials to the carrying area 108 of the material holding mechanism 100, and then the carrying area 108 moves relative to the leveling mechanism 700 under the action of the first driving assembly 301, the leveling mechanism 700 levels the printing material to a single layer of printing layer thickness, the carrying area 108 can also reciprocate under the action of the second driving assembly, realizing the back-and-forth staggered feeding of the supply assembly, and after the printing material is leveled to a single layer thickness by the leveling mechanism 700, the carrying area 108 can be moved to the lower side of the forming platform 502 under the action of the second driving assembly; then, the forming platform 502 is lowered to the position of the layer thickness of the printing material, and is attached to the printing material, the optical mechanism 400 projects the printing pattern to solidify the printing material from below, and after solidification, the forming platform 502 rises and separates to take away the solidified printing layer; the carrying area 108 continues to move to the lower side of the cleaning mechanism 600 under the action of the second driving assembly, and the cleaning mechanism 600 removes the un-solidified printing material and residues on the material holding mechanism 100. Thereafter, the second driving assembly continues to drive the carrying area 108 to move to the lower side of the feeding assembly 201, and so on, to print and form the printing piece. In this embodiment, the specific movement mode of the carrying area 108 under the action of the second driving assembly can be reciprocating planar movement, or can be the rolling type of circular movement as shown in Figure 15 and 16 The transparent film 101 forming the carrying area 108 rotates in the manner of a conveyor belt.

[0099] Alternatively, as shown in Figure 15 The feeding mechanism 200 is located on the right side of the forming platform mechanism 500, the movement direction of the upper transparent film is from right to left, the feeding mechanism on the right side first supplies the printing material 1000 on the transparent film, then the transparent film drives the printing material 1000 to move to the lower side of the forming platform mechanism 500, completes the photocuring and separation of the solidified layer, and then the cleaning mechanism 600 located above the leftmost side of the material holding mechanism 100 acts to clean the residual printing material into the waste collection device 601.

[0100] Alternatively, as shown in Figure 16As shown, the supply mechanism 200 is located on the right side of the forming platform mechanism 500, and the movement direction of the upper transparent film is to circulate around the optical mechanism. The right supply mechanism first supplies the printing material 1000 on the transparent film, and then the transparent film drives the printing material 1000 to move directly below the forming platform mechanism 500, completes the photocuring and separation of the cured layer, and then the cleaning mechanism 600 located on the left side of the supply mechanism 100 acts to clean the residual printing material into the waste collection device 601. In this embodiment, the transparent film circulates around the optical mechanism to avoid blocking the light path of the optical mechanism.

[0101] Generally, the movement path of the transparent film can be reasonably set according to the technical solution or user demand, and is not limited to left-right reciprocating motion or circulating motion around the optical mechanism, as long as the light path of the optical mechanism is not blocked. The position of the cleaning mechanism 600 is not limited to the left side, the right side, the upper side or the lower side of the supply mechanism, as long as the residual printing material on the carrying area can be removed. Preferably, it is arranged below the supply mechanism 100, which can avoid the space above the supply mechanism 100 being too crowded, and can fully utilize the gravity of the residual material itself to fall down, thereby improving the cleaning effect.

[0102] In some embodiments, the driving mechanism 300 includes a first driving assembly 301 and a second driving assembly. The first driving assembly 301 is configured to drive the supply assembly 201 to move in space, and the second driving assembly is configured to drive the carrying area 108 of the supply mechanism 100 to move in space, so that the supply assembly 201 and the carrying area 108 can both move in space. The superposition of the movements of the two achieves the relative movement of the supply assembly 201 and the carrying area 108. This embodiment is a combination of the first two embodiments, which will not be described here.

[0103] In the above embodiments, the height to which the forming platform 502 is lifted does not need to be higher than the supply assembly 201, which can save a lot of movement time.

[0104] In some embodiments, the supply mechanism 200 further includes a heating assembly configured to heat the supply assembly 201, so that the temperature of the supply assembly 201 is 20-100°C. The heating assembly can be a sheet-shaped, wire-shaped or other heating structure, and the heating principle can be electric heating, infrared heating, microwave heating, etc., which is not limited here. Since the environmental temperature has an impact on the forming quality of the printing material during printing, and the viscosity of the printing material is higher at low temperature, the printing material can be heated by the heating assembly in some cases where the environmental temperature is low, to ensure the normal printing. In this embodiment, the heating assembly can heat the printing material in the supply assembly 201.

[0105] The embodiment of the present application also provides a three-dimensional printing method, which can be applied to the three-dimensional printing device provided by the embodiment of the present application. The method of the embodiment manufactures a three-dimensional object in a layered manner based on computer object data. The three-dimensional object is manufactured in a layered manner by forming a plurality of layers in a configured pattern corresponding to the shape of the object. The computer object data can be presented in any known form, including but not limited to: standard tessellation language (STL) or stereolithography contour (SLC) format, virtual reality modeling language (VRML), additive manufacturing file (AMF) format, drawing exchange format (DXF), polygon file format (PLY) or any other format suitable for computer-aided design (CAD).

[0106] As shown in Figure 17 The three-dimensional printing method comprises the following steps:

[0107] Step 100: obtaining a three-dimensional model, dividing the three-dimensional model into a plurality of slice layers, and generating a corresponding printing strategy for each slice layer.

[0108] In this step, the product to be printed is formed into a three-dimensional model, and then the three-dimensional model is divided into a plurality of horizontal layers, i.e. slice layers. Then for each slice layer, a respective corresponding printing strategy is generated, which is used to provide instructions for the feeding mechanism 200, optical mechanism 400, driving mechanism 300 and forming platform mechanism 500 and other component units of the three-dimensional printing device to act in coordination to form a horizontal solidification layer corresponding to the slice layer.

[0109] The printing strategy at least includes relative motion information of the bearing area and the feeding assembly, material type of the printing material supplied by the feeding mechanism, and at least one of the projection information of the optical mechanism.

[0110] For the feeding mechanism 200, the printing strategy at least defines the feeding channel of the feeding assembly 201 for supplying the printing material, the diameter of the feeding channel, the relative motion path of the supply assembly, the type of the printing material and the supply amount of the printing material, etc., so as to be able to form the pattern required by the slice layer.

[0111] For the optical mechanism 400, the projection information of the optical mechanism in the printing strategy at least defines the projection pattern, the light transmission area, the light intensity, the time and the uniformity of the exposure, etc., so as to be able to more accurately realize the exposure of the printing material pattern.

[0112] The projection pattern is consistent with the outline of the slice layer. The projection method is used in the light curing technology. The shape pattern of the slice layer is projected onto the bearing area of the material holding mechanism through the optical mechanism, and then light curing and molding are performed. The whole layer image can be cured at one time, so that each layer can be quickly cured. Through this printing method, the projection profile of the projection surface is used to cure the edge of the printed part. The edge precision of the printed part depends on the projection precision of the optical mechanism. Compared with inkjet printing, the light source follows the nozzle without discrimination to expose and polymerize the liquid photopolymer layer on the build tray, and the printing precision is higher.

[0113] For the driving mechanism 300, the relative motion information between the bearing area and the supply assembly in the printing strategy at least defines the control instructions for realizing the relative motion of the supply assembly and the bearing area 108 according to the relative motion path.

[0114] Step 200: According to the printing strategy, the bearing area 108 of the material holding mechanism 100 is supplied with printing materials, wherein at least part of the slice layer corresponds to two or more types of materials.

[0115] In this step, the driving mechanism 300 acts, and the relative motion between the supply assembly 201 of the supply mechanism 200 and the bearing area 108 of the molding platform 502 occurs, so that the supply assembly 201 can be located at any position of the bearing area 108, to realize the supply of printing materials at any position of the bearing area 108.

[0116] The supply mechanism 200 can supply multiple types of printing materials to the bearing area 108 through the supply assembly 201, so that the required type of printing material can be supplied at different positions of the bearing area 108 as needed. Specifically, different types of printing materials are stored in different storage components of the storage assembly, different supply channels are in communication with the storage components storing different types of printing materials, and different types of printing materials are sprayed out through different supply channels of the nozzle assembly by using the pump body, so as to spray the printing materials on the bearing area 108 of the material holding mechanism 100 during the printing process. The supply assembly 201 can supply at least two different types of printing materials, which can realize color printing and can realize printing with different performance requirements. Preferably, one nozzle can correspond to four supply channels, and each supply channel can supply one type of printing material.

[0117] Step 300: The printing materials are exposed and cured through the optical structure according to the projection information to form a cured layer.

[0118] In this step, the forming platform 502 is gradually close to the bearing area 108 of the material containing mechanism 100 under the driving of the first lifting assembly 501, and the forming surface 5021 is attached to the upper surface of the printing material in the bearing area 108. The light of the optical mechanism 400 is irradiated into the printing material in the bearing area 108 after passing through the light-transmitting area, so that the printing material between the material containing mechanism 100 and the forming surface 5021 is solidified and solidified on the forming surface 5021 of the forming platform 502 or on the previous layer of printing material which has been solidified on the forming surface 5021.

[0119] Step 400: Control the forming platform mechanism to separate the solidified layer. Clean the residual printing material on the material containing mechanism 100. In this step, the forming platform 502 is gradually away from the bearing area 108 of the material containing mechanism 100 under the driving of the first lifting assembly 501, so that the solidified slice layer is separated from the material containing mechanism 100.

[0120] In some embodiments, after step 400, it further includes:

[0121] Step 500, clean the residual printing material on the material containing mechanism. That is, after the solidified slice layer is separated from the material containing mechanism 100, the cleaning mechanism 600 acts to clean the residual printing material on the material containing mechanism 100. The residual printing material includes un-solidified printing material and residual waste on the material containing mechanism 100.

[0122] In some embodiments, after step 200, it further includes step 210, that is, after the step of supplying the printing material of the corresponding type at different positions of the bearing area 108 of the material containing mechanism 100, it further includes step 210: leveling the printing material in the bearing area 108 to a preset thickness.

[0123] In this step, the leveling mechanism 700 acts to keep the thickness of the printing material supplied by the feeding assembly 201 in the bearing area 108 in a preset range in step 200, so that the thickness of the printing material is the required thickness of a single layer, and the leveling mechanism 700 can keep the printing material supplied by the feeding assembly 201 on the bearing area 108 at a uniform thickness, so that the printing process is refined and accurate, and the printing precision is improved.

[0124] In some embodiments, step 200 specifically includes steps 201-203, that is, according to the printing strategy, the step of supplying the printing material to the bearing area 108 of the material containing mechanism 100 includes:

[0125] In step 201, supply data information corresponding to each supply position in the bearing area 108 is generated according to a printing strategy. The supply data information at least includes path information of relative movement between the supply assembly 201 and the bearing area 108 and type information of the printing material. The type information of the printing material includes but is not limited to color information and material performance information.

[0126] In step 202, the driving mechanism 300 is actuated, and the supply assembly 201 and the bearing area 108 move relative to each other according to the path information, so that the position of the supply assembly 201 corresponds to the supply position.

[0127] In step 203, the supply mechanism 200 is actuated, and the supply assembly 201 supplies the printing material corresponding to the type information at the supply position.

[0128] Through steps 201-203, the supply of printing material at each position on the bearing area 108 can be realized according to the printing strategy, and finally the image of the slice layer to be solidified is formed.

[0129] In some embodiments, the three-dimensional model includes a first part and a second part. At the supply position corresponding to the first part, printing material with a first type of color is supplied, and at the supply position corresponding to the second part, printing material with a second type of color is supplied. The first type of color is one color or a combination of multiple colors, and the second type of color is one color or a combination of multiple colors. Through this embodiment, color printing of the three-dimensional model can be realized, and different color setting modes can be realized in different areas. It should be noted that the first type of color can be one color or a combination of multiple colors, and the second type of color can be one color or a combination of multiple colors.

[0130] In the case where the type information of the printing material is color information, as shown in Figure 18 and 19 As an optional implementation scenario, the first part of the three-dimensional model includes an outline 9011 of the three-dimensional model, and the second part includes a filling part 9012 and a sacrificial structure 902 of the three-dimensional model. The solid structure 901 of the three-dimensional model can be the outline 9011 and / or the filling part 9012, and the sacrificial structure 902 can be a bottom plate 9021 and / or a support part 9022 of the three-dimensional model, as shown in Figure 19As shown, the bottom plate 9021 is used to connect with the forming platform 502, and is located at the lowermost layer. Above the bottom plate 9021 is the support part 9022, and above the support part 9022 is the entity structure 901. The bottom plate 9021 and the support part 9022 of the three-dimensional model can be a part structure that provides overall strength support in the three-dimensional model, or can be a structure that is discarded after the three-dimensional model is printed and formed, and has no specific requirements for color. In the forming process of each slice layer, the supply position corresponding to the contour 9011 of the three-dimensional model supplies the printing material corresponding to the color required by the contour 9011 of the three-dimensional model, that is, supplies the printing material corresponding to the first type of color. The supply position corresponding to the filling part 9012 of the three-dimensional model and the sacrificial structure 902 supplies the monochromatic printing material, that is, supplies the printing material corresponding to the second type of color. In this way, the contour 9011 of the three-dimensional model with the required color can be directly printed. The first type of color is one or a series of colors required by the contour 9011 of the three-dimensional model, and the second type of color is selected as a pure color.

[0131] As shown in FIG. 9, in the case where the type information of the printing material is color information, the three-dimensional model is divided into a first part and a second part. The first part includes the filling part 9012 of the three-dimensional model, and the second part includes the contour 9011 of the three-dimensional model and the sacrificial structure 902. In the forming process of each slice layer, the supply position corresponding to the contour 9011 of the three-dimensional model supplies the printing material corresponding to the color required by the contour 9011 of the three-dimensional model, that is, supplies the printing material corresponding to the first type of color. The supply position corresponding to the filling part 9012 of the three-dimensional model supplies the printing material corresponding to the color required by the filling part 9012 of the three-dimensional model, that is, supplies the printing material corresponding to the second type of color. In this way, the filling part 9012 of the three-dimensional model with the required color can be directly printed. Figure 18 19 As shown in FIG. 9, in the case where the type information of the printing material is color information, the three-dimensional model is divided into a first part and a second part. The first part includes the filling part 9012 of the three-dimensional model, and the second part includes the contour 9011 of the three-dimensional model and the sacrificial structure 902. In the forming process of each slice layer, the supply position corresponding to the contour 9011 of the three-dimensional model supplies the printing material corresponding to the color required by the contour 9011 of the three-dimensional model, that is, supplies the printing material corresponding to the first type of color. The supply position corresponding to the filling part 9012 of the three-dimensional model supplies the printing material corresponding to the color required by the filling part 9012 of the three-dimensional model, that is, supplies the printing material corresponding to the second type of color. In this way, the filling part 9012 of the three-dimensional model with the required color can be directly printed.

[0132] As shown in FIG. 9, in the case where the type information of the printing material is color information, the three-dimensional model is divided into a first part and a second part. The first part includes the filling part 9012 of the three-dimensional model, and the second part includes the contour 9011 of the three-dimensional model and the sacrificial structure 902. In the forming process of each slice layer, the supply position corresponding to the contour 9011 of the three-dimensional model supplies the printing material corresponding to the color required by the contour 9011 of the three-dimensional model, that is, supplies the printing material corresponding to the first type of color. The supply position corresponding to the filling part 9012 of the three-dimensional model supplies the printing material corresponding to the color required by the filling part 9012 of the three-dimensional model, that is, supplies the printing material corresponding to the second type of color. In this way, the filling part 9012 of the three-dimensional model with the required color can be directly printed. Figure 20 ​As shown, as an optional implementation scenario, the thickness dimension of the contour 9011 of the three-dimensional model is large, and it is not economical to print the entire contour 9011 with color, and the following optimization can be performed: the first part of the three-dimensional model includes the outer layer 9013 of the solid structure 901 of the three-dimensional model, which can be the outer layer 9013 of the contour 9011, and the second part includes other regions of the solid structure 901 of the three-dimensional model (for example, the inner layer 9014 of the solid structure 901) and the sacrificial structure 902, wherein the sacrificial structure 902 can be the bottom plate 9021 and / or the support part 9022 of the three-dimensional model. The bottom plate 9021 and the support part 9022 of the three-dimensional model can be a part of the structure that provides overall strength support in the three-dimensional model, or can be a structure that needs to be discarded after the three-dimensional model is printed and formed, and there is no specific requirement for color. The inner layer 9014 of the solid structure 901 is a part that does not appear in the appearance of the product, and there can also be no specific requirement for color. In the forming process of each slice layer, the feeding position corresponding to the outer layer 9013 of the solid structure 901 of the three-dimensional model supplies the printing material corresponding to the color required by the outer layer of the solid structure 901 of the three-dimensional model, that is, the printing material corresponding to the first type of color, and the feeding position corresponding to the filling part 9012, the support part 9022 and other regions of the solid structure 901 of the three-dimensional model supplies the monochromatic printing material, that is, the printing material corresponding to the second type of color. In this way, the solid structure 901 of the three-dimensional model with the outer layer 9013 having the required color can be directly printed. The first type of color is one or a series of colors required by the outer layer 9013 of the solid structure 901 of the three-dimensional model, and the second type of color is selected to be a pure color.

[0133] In some embodiments, the three-dimensional model includes a first part and a second part, and the feeding position corresponding to the first part supplies the printing material with the first type of performance, and the feeding position corresponding to the second part supplies the printing material with the second type of performance. Through this embodiment, the combination printing of different performance materials of the three-dimensional model can be realized, and different material performance setting modes can be realized in different regions.

[0134] As an optional implementation scenario, as shown in FIG. 9B, the three-dimensional model includes a solid structure 901 and a sacrificial structure 902, and the solid structure 901 includes a contour 9011 and a filling part 9012. The contour 9011 of the solid structure 901 can be the outer layer 9013 of the solid structure 901, and the filling part 9012 of the solid structure 901 can be the inner layer 9014 of the solid structure 901. Figure 18 and 19As shown, the first part of the three-dimensional model is the contour 9011 of the three-dimensional model, and the second part of the three-dimensional model is the filling part 9012 and / or the sacrificial structure 902 of the three-dimensional model, wherein the sacrificial structure 902 can be the bottom plate 9021 and / or the support part 9022 of the three-dimensional model. In the forming process of each slice layer, the feeding position corresponding to the contour 9011 of the three-dimensional model supplies the printing material with high strength performance, and the feeding position corresponding to the filling part 9012 and the sacrificial structure 902 of the three-dimensional model can supply the printing material with relatively low structural strength, so that the three-dimensional model with different material properties of the contour 9011 and the sacrificial structure 902 can be directly printed.

[0135] For example, the first part of the three-dimensional model is the contour 9011 of the three-dimensional model, and the second part of the three-dimensional model is the support part 9022 of the three-dimensional model. In the forming process of each slice layer, the feeding position corresponding to the contour 9011 of the three-dimensional model supplies the main printing material corresponding to the contour 9011, and the feeding position corresponding to the support part 9022 of the three-dimensional model can supply a specific solvent-soluble material as the printing material. The support part 9022 formed by curing the specific solvent-soluble material can be directly removed by dissolving the corresponding solvent. For example, the specific solvent-soluble material can be selected as a water-soluble material, and other resin materials (non-water-soluble) are used as the main printing material during printing of the three-dimensional model. After the three-dimensional model is printed, the support part 9022 can be removed by water dissolving, so that the printed part can be easily removed. In addition, the support part 9022 formed by the water-soluble material can reduce the external force of mechanical removal (such as scraping or removing) when the support part 9022 is removed by water dissolving, and the surface quality of the printed model can be improved. The water-soluble material can be a water-soluble polymer, and the monomer used can be acrylic acid, methacrylic acid, acrylamide, dimethyl acrylamide, dimethylaminoethyl methacrylate, ethylene pyrrolidone, etc. Of course, the specific solvent-soluble material can be selected as other materials that can be dissolved by a specific solvent, such as oil-soluble materials, alcohol-soluble materials, etc., as long as the main material of the contour 9011 of the three-dimensional model can be distinguished.

[0136] As an optional implementation scenario, the first part of the three-dimensional model is a first main structure, and the second part of the three-dimensional model is a second main structure of the three-dimensional model. In the forming process of each slice layer, the feeding position corresponding to the first main structure of the three-dimensional model supplies the printing material with mechanical properties in a first interval, and the feeding position corresponding to the second main structure of the three-dimensional model can supply the printing material with mechanical properties in a second interval, wherein the first interval is different from the second interval, so that the three-dimensional model with different material properties of the first main structure and the second main structure can be directly printed.

[0137] In some embodiments, the step 100 of dividing the model into a plurality of slice layers can further include:

[0138] The step 101 of generating a series of slice layers from the three-dimensional model;

[0139] The step 102 of dividing at least part of the area of at least part of the slice layers into a plurality of sub-areas, wherein at least part of the adjacent sub-areas have gaps therebetween. In the above step, as shown in Figure 21 The step 102 of dividing at least part of the area of at least part of the slice layers into a plurality of sub-areas 904 is equivalent to performing a lattice treatment on at least part of the area of the slice layer, and the adjacent lattices have gaps 905 therebetween, so that when the forming platform is lowered to press the lattice-distributed printing material, the printing material in the lattice is extruded and overflowed to fill the gaps 905 between the sub-areas 904, so as not to cause color mixing. The specific shape of each sub-area 904 can be many possibilities, including but not limited to circular, square, triangular, polygonal, etc. Optionally, the entire area of the slice layer can be divided into a plurality of sub-areas 904 and subjected to lattice treatment; optionally, the area corresponding to the outline in the slice layer can be subjected to lattice treatment, and the area corresponding to the filling part is not subjected to lattice treatment; optionally, the area corresponding to the filling part in the slice layer can be subjected to lattice treatment, and the area corresponding to the outline is not subjected to lattice treatment. The slice layer lattice treatment can be set as required by the technical solution, and can be performed at any position, on a certain layer, or on a certain area of a certain layer.

[0140] In some embodiments, the feeding assembly 201 is provided with a heating assembly to heat the printing material when needed, reduce the viscosity of the printing material, and improve the feeding speed and uniformity of the feeding assembly 201. Preferably, the printing material can be heated to 20-100℃.

[0141] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0142] In the description of the application, it is necessary to point out that, unless otherwise clearly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0143] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A three-dimensional printing method, characterized in that: include: -Supplying materials through a feeding mechanism of a 3D printing device, including at least one of the following: - supplying cyan material to a carrying area of ​​a light-transmissive material holding mechanism of the 3D printing device through a first channel of the material feeding mechanism; - supplying magenta material to the carrying area through the second channel of the feeding mechanism; - yellow material is supplied to the carrying area through the third channel of the feeding mechanism; - supplying black material to the carrying area through the fourth channel of the feeding mechanism; or - supplying transparent material to the carrying area through the fifth channel of the feeding mechanism; - moving a build platform mechanism of the 3D printing device so that the build platform mechanism contacts the material in the support area; - projecting light onto the supporting area through an optical mechanism of the 3D printing device to solidify the material supplied by the feeding mechanism and form a solidified layer adhered to the building platform mechanism; and -Move the forming platform away from the material holding mechanism to separate the solidified layer from the material holding mechanism, The solidified layer includes a portion formed of at least two of the following compositions: a cyan material, a magenta material, a yellow material, a black material, and a transparent material.

2. The three-dimensional printing method according to claim 1, wherein the solidified layer further comprises at least one of the following: a portion formed of a cyan material, a portion formed of a magenta material, a portion formed of a yellow material, a portion formed of a black material, and a portion formed of a transparent material.

3. The 3D printing method according to claim 1, wherein supplying materials through a feeding mechanism of the 3D printing device further comprises: The white material is supplied to the carrying area through the sixth channel of the feeding mechanism.

4. The three-dimensional printing device according to claim 1, wherein: The feeding mechanism further comprises a material storage component, a pump body and a pipeline, wherein the pump body is configured to control the supply volume of any channel of the feeding mechanism. 5 . The three-dimensional printing apparatus according to claim 4 , wherein the feeding mechanism is configured to supply materials of at least two colors in a predetermined ratio at a preset position of the carrying area, so as to allow supply of materials of any color.

6. The 3D printing method according to claim 1, wherein supplying material through a feeding mechanism of the 3D printing device further comprises: Compositions of different colors are obtained by at least one of changing the color components, the droplet size of the materials, the color sequence of the materials, and the stacking of the materials.

7. The three-dimensional printing method according to claim 1, wherein: Supplying the first material includes supplying the first material in droplet form, and supplying the second material includes supplying the second material in droplet form.

8. The three-dimensional printing method according to claim 7, wherein: The bearing area includes a plurality of sub-areas and gaps between the plurality of sub-areas; The moving the forming platform mechanism of the three-dimensional printing device so that the forming platform mechanism contacts the material in the supporting area further comprises: when the forming platform descends and presses down the lattice-distributed material, the material in the lattice is squeezed and overflows to fill the gaps between the sub-areas.

9. The three-dimensional printing method according to claim 1, wherein projecting light comprises projecting light based on projection information, and the projection information comprises at least one of the following: a projection pattern, a light-transmitting area, exposure intensity, exposure time, or exposure uniformity.

10. The three-dimensional printing method according to claim 1, wherein the projecting light comprises: - projecting light during the same time period to simultaneously cure the first material and the second material; or - Projecting light to cure a first material during a first time period, and projecting light to cure a second material during a second time period subsequent to the first time period.

11. The three-dimensional printing method according to claim 1, wherein the optical mechanism is any one of a DLP projection system, a Micro-LED display system, an LCOS optical system, an LCD display system, or a laser galvanometer scanning system.

12. The three-dimensional printing method according to claim 1, further comprising: The feeding mechanism and the optical mechanism are calibrated to calibrate the relative position of the projection of the optical mechanism and the movement of the feeding mechanism.

13. A three-dimensional printing device, characterized in that: include: - a material receiving mechanism having a light-transmissive film, said film defining a carrying area; a feeding mechanism comprising a first channel and a second channel, wherein the first channel is configured to supply a first material to the carrying area, and the second channel is configured to supply a second material different from the first material to the carrying area; - an optical mechanism configured to project light onto the load-bearing area; and - a molding platform mechanism capable of moving closer to or further away from a target position, wherein When the forming platform mechanism is at the target position, the optical mechanism is allowed to project light onto the carrying area to form a solidified layer, wherein the solidified layer includes a first portion formed of a first material and a second portion formed of a second material; and The forming platform mechanism is configured to move away from the target position to separate the solidified layer including the first portion and the second portion from the holding mechanism.

Images