Easy-to-operate 3D printing device and method

Abstract

The present application relates to a 3D printing apparatus and method that are convenient to operate. The 3D printing apparatus includes a liquid tank, a print platform, a release film assembly, a leveling hob assembly, and an air bubble scraper. One side of the liquid tank is widened to form a stretching area. The air bubble scraper is disposed in the stretching area and fixed to the lower side of the stretching area of ​​the liquid tank and close to the main body area. The release film assembly and the leveling hob assembly can both move laterally. The beneficial effects of the present invention are as follows: 1. The number of manual operations before and after printing is small, and the operation is simple. 2. Since the leveling hob is a delicate and fragile member, the present invention reduces the risk of damage caused by frequent manual installation and removal of the leveling hob, and reduces the time waste caused by repeated leveling of the hob by reinstalling the leveling hob. 3. Since the liquid resin adheres when removing the release film, the present invention reduces the risk of contamination caused by the dropping of the liquid resin.

Description

[Technical Field]

[0001] The present application relates to the technical field of light-curing 3D printing, and in particular to an easy-to-operate 3D printing apparatus and method. [Background technology]

[0002] Currently, high-precision photocuring 3D printing often uses a design where the photosensitive resin is positioned above the light source and the liquid tank is positioned below. The goal is to achieve high precision by using thinner release films or self-leveling methods to project patterns more accurately onto the photosensitive resin. However, as print format requirements increase and the viscosity of the liquid resin increases, even with the release film method, long leveling times are required during actual printing to achieve the ideal layer thickness. Therefore, BMF has developed a new hob high-speed leveling method to solve the problem of reduced efficiency due to long print leveling times. Figure 1 shows the current 3D printing structure principle. The optical path is located above the liquid tank 1, and the release film assembly 3 is fixed to the liquid tank 1. When the print platform 2 rises, the liquid resin 6 is pulled up, causing the release film assembly 3 to bulge upward. At this time, the leveling hob assembly 4 mounted on the upper surface of the release film assembly 3 rotates left and right to eliminate the bulge of the release film assembly 3. This method significantly reduces the leveling wait time during printing. This method also includes an air bubble scraper 5 that is in close contact with the underside of the release film assembly 3 and can slide left and right. Its purpose is to remove air bubbles on the underside of the release film assembly 3 so that they do not affect print quality. In the current method, before each printing, the printing platform 2 must first be manually installed, then the release film assembly 3 must be manually installed, and finally the leveling hob assembly 4 must be manually installed. After each printing is completed, in order to obtain a printed sample, the leveling hob assembly 4 must first be manually removed, then the release film assembly 3 must be manually removed, and finally the printing platform 2 must be manually removed.

[0003] Currently, when using the hob high-speed leveling method, before each printing, the printing platform 2 must be manually installed, then the release film assembly 3 must be manually installed, and finally the leveling hob assembly 4 must be manually installed. After each printing is completed, in order to obtain the printed sample, the leveling hob assembly 4 must first be manually removed, then the release film assembly must be manually removed, and finally the printing platform 2 must be manually removed.

[0004] Currently, the drawbacks of this method are as follows: 1. The manual operations before and after printing are cumbersome and complicated. 2. The leveling hob is a delicate and fragile component that is at risk of being damaged if it is frequently manually installed and removed. 3. When removing the release film, liquid resin adheres to the surface, which poses a risk of contamination due to the liquid resin falling. Summary of the Invention

[0005] The technical problem that the present invention aims to solve is that in conventional light-curing 3D printing devices, when taking a printed sample, after each printing is completed, the leveling hob must first be manually removed, then the release film assembly must be manually removed, and finally the printing platform must be manually removed to obtain the printed sample. This problem is solved by providing a 3D printing device and method that is easy to operate.

[0006] The technical solution of the present invention is an easy-to-operate 3D printing device, which includes a liquid tank, a printing platform, a release film assembly, a leveling hob assembly, and an air bubble scraper 5. the liquid tank is used to contain liquid resin for printing, and has a main body region and an extension region, the extension region being disposed on one side of an upper portion of the main body region; the print platform is used to carry a print sample and enter the body region of the fluid tank; The release film assembly includes a release film and a release film drive assembly, and the release film drive assembly is used to translate the release film so that the release film can move between the main body region or the extension region. The leveling hob assembly includes a leveling hob body and a hob drive assembly. The hob drive assembly is used to translate the leveling hob body so that the leveling hob body can move between the body sections or the extension regions. The lowest portion of the leveling hob body is flush with the upper surface of the release film. The bubble scraper is disposed in the stretching region and fixed to a lower portion of the stretching region of the liquid tank near the main body region, with an upper portion of the bubble scraper aligned with a lower portion of the release film.

[0007] Preferably, in the conveniently operable 3D printing apparatus according to the present invention, the bubble scraper is attached to the lower part of the extension region of the liquid tank via a spring and a guide shaft.

[0008] Preferably, in the conveniently operated 3D printing apparatus according to the present invention, the release film assembly is a mounting substrate; a linear guide rail fixed on the mounting substrate along a first direction in which the print platform moves between the body region and the extension region of the fluid tank; a release film holder assembly that can move along a first direction by being driven by a release film drive assembly mounted on the linear guide rail, the release film holder assembly having a release film attachment jig member, and a release film attached to the release film attachment jig member.

[0009] Preferably, in the conveniently operable 3D printing apparatus according to the present invention, the release film holder assembly comprises: a transmission frame connected to the linear guide rail via a first slide block; A release film horizontal adjustment support column fixed to the transmission frame; and a horizontal adjustment frame connected to the release film horizontal adjustment column via a release film horizontal adjustment knob, to which the release film tensioning jig member is attached.

[0010] Preferably, in the conveniently operable 3D printing apparatus according to the present invention, the release film drive assembly comprises: a first step motor secured to a lower portion of the mounting board; a first synchronous belt connected to the first step motor and the transmission frame for driving the transmission frame;

[0011] Preferably, in the conveniently operable 3D printing apparatus according to the present invention, limit stoppers are further provided on the mounting base, which are disposed at the four corners of the mounting base to prevent the movement of the transmission frame from exceeding the movement limit.

[0012] Preferably, the easy-to-operate 3D printing device of the present invention further includes a position sensor mounted on the mounting substrate. The sensor is attached to one edge of the mounting substrate and is used to sense the position of the transmission frame. The lateral movement position of the release film application jig member is limited by the position sensor.

[0013] Preferably, in the conveniently operable 3D printing apparatus according to the present invention, the hob drive assembly comprises: a second step motor secured to the bottom of the mounting board; a second synchronous belt connected to the second step motor and to a hob holder assembly for driving the hob holder assembly, the hob holder assembly being movably mounted on the linear guide rail;

[0014] Preferably, in the conveniently operable 3D printing apparatus according to the present invention, the hob holder assembly comprises: a transmission connecting rod connected to the linear guide rail via a second slide block; The transmission connecting rod includes a rear hob leveling support and a front hob leveling support, respectively attached to both sides of the transmission connecting rod, and the connection points of the rear hob leveling support and the front hob leveling support and the transmission connecting rod are adjusted by a rear hob leveling knob and a front hob leveling knob, respectively. The upper portions of the rear hob leveling column and the front hob leveling column are connected to the leveling hob body.

[0015] A 3D printing method using the above 3D printing device, in which a liquid is horizontally extruded and coated using a release film, Step S1: moving a release film and leveling hob assembly to a stretching area and attaching a print platform to a body area of ​​a liquid tank; Step S2: Control the release film to move to the main body area, control the print platform to move up and down to the print waiting position, ensure that the distance between the print platform and the lower surface of the release film is one layer thickness, and wait for leveling; Step S3: holding the release film so that it does not move, the leveling hob assembly starts to move toward the main body region of the liquid tank, moves to the left or right edge closer to the release film, and then stops; Step S4: holding the release film so that it does not move, and moving the leveling hob assembly to the other edge of the release film; Step S5: repeating steps S3 and S4 until the bulge in the release film is removed; Step S6: focusing the pattern on the release film by a UV lens, and performing exposure and curing to obtain a cured pattern; Step S7: controlling the print platform to descend and separating the cured print sample from the release film; Step S8: controlling the release film and leveling hob assembly to move laterally to the stretching region of the liquid tank, and then controlling the bubble scraper to rise and come into close contact with the lower surface of the release film; Step S9: Control the release film and leveling hob assembly to move laterally to the main body area of ​​the liquid tank, and simultaneously use the bubble scraper to scrape out bubbles on the lower surface of the release film, and then control the bubble scraper to descend; Step S10: repeating steps S2 to S9 until the sample printing is completed; and step S11 of controlling the release film and leveling hob assembly to move laterally to the drawing area of ​​the fluid tank, and removing the print platform carrying the print sample.

[0016] The beneficial effects of the present invention are as follows: 1. The number of manual operations required before and after printing is small, making operation simple. 2. Because the leveling hob is a delicate and fragile component, the present invention reduces the risk of damage caused by frequently manually attaching and detaching the leveling hob, and reduces the time wasted by repeatedly leveling the hob by reinstalling the leveling hob. 3. Because the liquid resin adheres when the release film is removed, the present invention reduces the risk of contamination caused by the liquid resin falling. [Brief explanation of the drawings]

[0017] The technical solutions of the present application are described in further detail below with reference to the accompanying drawings and examples. [Figure 1] This is a schematic diagram of the principle of conventional hob-leveling 3D printing. [Figure 2] 1 is a structural schematic diagram of a conveniently operated 3D printing device according to an embodiment of the present application; FIG. [Figure 3] 1 is a schematic diagram of the operation steps of a conveniently operable 3D printing device according to an embodiment of the present application; FIG. [Figure 4] 1 is a perspective view of the overall structure of a conveniently operable 3D printing device according to an embodiment of the present application; [Figure 5] 1 is a side view of the overall structure of an easy-to-operate 3D printing device according to an embodiment of the present application. FIG. [Figure 6] 1 is a structural schematic diagram of a release film assembly and a leveling hob assembly according to an embodiment of the present application. FIG. [Figure 7] 1 is a structural schematic diagram of a liquid tank member according to an embodiment of the present application. [Figure 8] 1 is a structural schematic diagram of a leveling hob body and a bubble scraper body according to an embodiment of the present application; FIG. [Explanation of symbols]

[0018] 1. Liquid tank, 2. Print platform, 3. Release film assembly, 4. Leveling hob assembly, 5. Air bubble scraper, 6. Liquid resin, 7. Print sample, 8. UV lens, 122, 124. First slide block, 123. Second slide block, 101. Mounting board, 102, 103. Linear guide rail, 104. Second step motor, 105. First step motor, 106. Second synchronous belt, 107. First synchronous belt, 10 8. Limit stopper, 109. Transmission frame, 110, 111, 112. Release film leveling adjustment support, 113. Leveling frame, 114. Position sensor, 115. Transmission connecting rod, 116. Rear hob leveling adjustment support, 117. Front hob leveling adjustment support, 118. Rear hob leveling adjustment knob, 119. Front hob leveling adjustment knob, 120, 121. Release film leveling adjustment knob, 500. Release film tensioning jig component, 200. Liquid tank main body, 400. Air bubble scraper main body. DETAILED DESCRIPTION OF THE INVENTION

[0019] Furthermore, where no contradiction exists, the embodiments and features in the embodiments of the present application can be combined with each other.

[0020] In describing the present invention, the orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the drawings and are merely intended to facilitate the description of the present application. They do not necessarily indicate or suggest that the referenced devices or components have a specific orientation or are structured or operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. Furthermore, terms such as "first," "second," and the like are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features shown. Therefore, a feature qualified by "first," "second," etc. may explicitly or implicitly include one or more of the feature. In describing the present invention, unless otherwise specified, "plurality" means two or more.

[0021] In the description of this application, unless otherwise clearly defined and limited, the terms "attached," "coupled," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, or an integral connection. They may refer to a mechanical connection or an electrical connection. They may refer to a direct connection, an indirect connection via an intermediate medium, or an internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0022] The technical solutions of the present application are described in detail below with reference to the accompanying drawings and examples. Example

[0023] This embodiment provides a convenient 3D printing apparatus. As shown in Figure 2, the apparatus includes a liquid tank 1, a print platform 2, a release film assembly 3, a leveling hob assembly 4, and an air bubble scraper 5. The liquid tank 1 is used to contain liquid resin 6 for printing and has a main body region and a stretching region. The stretching region is located on one side of the top of the main body region. The print platform 2 is used to carry a print sample 7 into the body region of the fluid tank 1 . The release film assembly 3 includes a release film and a release film drive assembly, and the release film drive assembly is used to translate the release film so that the release film can move between the main body region or the extension region. The leveling hob assembly 4 includes a leveling hob body 300 and a hob drive assembly. The hob drive assembly is used to translate the leveling hob body 300 so that the leveling hob body 300 can move between the body sections or the extension regions. The bottom portion of the leveling hob body 300 is flush with the upper surface of the release film. The bubble scraper 5 is disposed in the stretching region and fixed to the lower side of the stretching region of the liquid tank 1, closer to the main body region. The upper part of the bubble scraper 5 is aligned with the lower part of the release film.

[0024] In this embodiment of the 3D printing apparatus, the print platform 2 is driven by a moving shaft (not shown), and the lifting and lowering of the print platform 2, the movement of the release film assembly 3, and UV exposure are controlled by control software on an industrial control computer. The control software executes the operation of each component according to the flowchart in Figure 3. The liquid tank 1, release film assembly 3, leveling hob 4, and bubble scraper 5, as well as the specific printing process, have been improved from the conventional system (shown in Figure 1). The width of the left side of the liquid tank 1 has been increased, the release film assembly 3 has been given the ability to move laterally to the left and right, and the mounting structure of the bubble scraper 5 has been modified. When taking print samples, there is no need to disassemble the release film assembly and leveling hob assembly. After printing is complete, the print platform 2 can be easily attached or detached by simply moving the release film laterally to the left end of the liquid tank 1.

[0025] The bubble scraper 5 is attached to the lower part of the stretching region of the liquid tank 1 via a spring and a guide shaft. The action of the spring and guide shaft allows the bubble scraper 5 to float slightly up and down within a range of 2 mm. When the release film moves laterally from side to side, the bubble scraper 5 also moves laterally from side to side relative to the release film, completing the function of scraping off bubbles. The bubble scraper 5 may be a one-way bubble scraper or a two-way bubble scraper. For information on one-way bubble scrapers, see Patent Publication No. CN113942224A.

[0026] In the 3D printing apparatus of this embodiment, both the print platform 2 and the release film are already leveled and focused before printing, as shown in Figure 3. The method used includes the following steps: 1. Installing the print platform: The release film and leveling hob assembly 4 is moved laterally to the left of the liquid tank 1 and the print platform 2 is installed. 2. Step of moving to print waiting position: The release film and leveling hob assembly 4 moves laterally to the print waiting position on the right side of the liquid tank 1. 3. Step of raising the print platform: The print platform 2 rises and moves away from the lower surface of the release film by a distance of one layer thickness, and waits for leveling. 4. First step of rolling leveling: The release film is stationary against the liquid tank 1, and the leveling hob assembly 4 starts moving toward the left and stops after moving to the left side of the release film. 5. Second step of rolling leveling: The release film is stationary against the liquid tank 1, and the leveling hob assembly 4 begins to move towards the right, moving to the right side of the release film. 6. Repeat rolling leveling step: Repeat steps 3 to 5 until the bulge in the release film is removed. 7. Exposure step: UV surface projection is passed through UV lens 8 to focus the pattern onto the release film, and exposure and curing are carried out to obtain a hardened pattern. The exposure can be a single projection exposure, a multi-light projection exposure, or an XY axis driven multi-projection exposure. 8. Demolding step: The print platform 2 descends to separate the cured print sample 7 from the release film. 9. First step of bubble scraping: The release film and leveling hob assembly 4 moves laterally to the left to the left side of the liquid tank 1 and triggers the one-way bubble scraper 5 to rise and come into close contact with the underside of the release film. 10. Second step of air bubble scraping: The release film and leveling hob assembly 4 moves laterally to the right to the print waiting position on the right side of the liquid tank 1. During this process, the air bubble scraper 5 is activated to scrape the air bubbles from the underside of the release film. As they move to the right side of the liquid tank 1, they trigger the one-way air bubble scraper 5 to descend and separate from the underside of the release film. 11. Layer-by-layer printing steps: Repeat steps 3-10 until the sample is printed. 12. Remove Print Platform: The release film and leveling hob assembly 4 is moved laterally to the left of the fluid tank 1 and the print platform 2 carrying the print sample 7 is removed.

[0027] Preferably, in the 3D printing apparatus of this embodiment, the liquid tank body 200 of the liquid tank 1 is hollow and can store liquid resin, as shown in Figures 4, 5, and 7. As shown in Figure 7, the right side is the body region of the liquid tank 1, which is deeper, and the left side is the extension region of the liquid tank 1, which is shallower, and the bubble scraper body 400 is fixed to the lower edge on the side closest to the body region.

[0028] Preferably, as shown in FIGS. 4, 5 and 6, the release film assembly 3 is a mounting substrate 101; Linear guide rails 102, 103 fixed on a mounting substrate 101 along a first direction (a direction in which the print platform 2 moves between the main body region and the extension region of the liquid tank 1); a release film holder assembly that can move along a first direction by being driven by a release film drive assembly mounted on the linear guide rails 102, 103, the release film holder assembly having a release film application jig member 500, and a release film attached to the release film application jig member 500. Preferably, as shown in FIGS. 5 and 6, the release film holder assembly comprises: a transmission frame 109 connected to the linear guide rails 102 and 103 via first slide blocks 122 and 124; release film level adjustment columns 110, 111, 112 fixed to the transmission frame 109; The horizontal adjustment frame 113 is connected to the release film horizontal adjustment posts 110, 111, 112 via release film horizontal adjustment knobs 120, 121, and the release film tensioning jig member 500 is attached to the horizontal adjustment frame 113.

[0029] This structure allows the release film holder assembly to move along the first direction. The horizontal adjustment frame 113 can be adjusted for horizontality using the release film horizontal adjustment knobs 120 and 121. Specifically, as shown in FIG. 6 , the transmission frame 109 and the horizontal adjustment frame 113 are rectangular, and the release film horizontal adjustment columns 110, 111, and 112 are attached to the three corners of the transmission frame 109 and the horizontal adjustment frame 113. Adjusting the horizontality of the horizontal adjustment frame 113 is equivalent to adjusting the horizontality of the release film attachment jig member 500, which ensures that the release film is parallel to the projection focal plane. The upper ends of the three release film horizontal adjustment columns are connected to the horizontal adjustment frame 113 via tension springs (not shown), horizontal adjustment knobs, and steel balls (not shown), ensuring that the horizontal adjustment of the horizontal adjustment frame 113 is achieved using the horizontal adjustment knobs. There are two horizontal adjustment knobs.

[0030] Preferably, as shown in FIG. 6, the release film drive assembly comprises: a first step motor 105 fixed to the bottom of the mounting substrate 101; and a first synchronous belt 107 connected to the first step motor 105 and the transmission frame 109 to drive the transmission frame 109. Optionally, the release film driving assembly may be any linear movement driving assembly, such as a method employing a step motor, a linear guide rail and a synchronous belt, or may be, for example, a servo motor + linear guide rail + lead screw, or any other assembly capable of realizing linear movement.

[0031] Preferably, in the conveniently operable 3D printing apparatus according to this embodiment, as shown in FIG. 6, the hob drive assembly includes: a second step motor 104 fixed to the bottom of the mounting substrate 101; and a second synchronous belt 106 connected to the second step motor 104 and to a hob holder assembly movably mounted on the linear guide rails 102, 103 to drive the hob holder assembly. Furthermore, the second synchronous belt 106 is mounted in parallel alignment with the first synchronous belt 107 and may share a mounting bracket.

[0032] Preferably, in the conveniently operated 3D printing apparatus according to this embodiment, as shown in FIG. 6, the hob holder assembly includes: a transmission connecting rod 115 connected to the linear guide rails 102, 103 via a second slide block 123; The transmission connecting rod 115 includes a rear hob leveling support 116 and a front hob leveling support 117, which are respectively attached to both sides of the transmission connecting rod 115. The connection points of the rear hob leveling support 116 and the front hob leveling support 117 with the transmission connecting rod 115 are adjusted by a rear hob leveling knob 118 and a front hob leveling knob 119, respectively. The upper portions of the rear hob leveling support 116 and the front hob leveling support 117 are connected to the leveling hob body 300 .

[0033] Preferably, as shown in Fig. 6, limit stoppers 108 are further provided on the mounting substrate 101. The limit stoppers 108 are arranged at the four corners of the mounting substrate 101 and are used to prevent the movement of the transmission frame 109 from exceeding the movement limit. A position sensor 114 is further provided on the mounting substrate 101. The sensor 114 is attached to one edge of the mounting substrate 101 and is used to sense the position of the transmission frame 109. The lateral movement position of the release film attachment jig member 500 is limited by the position sensor 114.

[0034] Taking the above ideal embodiment of the present application as an indication, those skilled in the art can make various changes and modifications through the above description without departing from the technical idea of ​​the present application. The technical scope of the present application is not limited to the content of the specification, but should be determined based on the claims.

Claims

1. A 3D printing device that is easy to operate, comprising a liquid tank (1), a print platform (2), a release film assembly (3), a leveling hob assembly (4), and an air bubble scraper (5); The liquid tank (1) is used to contain liquid resin (6) for printing, and has a main body region and an extension region, the extension region being located on one side of the upper portion of the main body region; The printing platform (2) is used to carry a printing sample (7) and enter the body region of the liquid tank (1); The release film assembly (3) includes a release film and a release film drive assembly, and the release film drive assembly is used to translate the release film so that the release film can move between the main body region or the stretching region; The leveling hob assembly (4) includes a leveling hob body (300) and a hob drive assembly, the hob drive assembly being used to translate the leveling hob body (300) so that the leveling hob body (300) can move between the body region or the extension region, and the lowest part of the leveling hob body (300) is flush with the upper surface of the release film; The bubble scraper (5) is disposed in the stretching region and fixed to a lower part of the stretching region of the liquid tank (1) on a side closer to the main body region, and an upper part of the bubble scraper (5) is aligned with a lower part of the release film.

2. 2. The easy-to-operate 3D printing device according to claim 1, characterized in that the bubble scraper (5) is attached to the lower part of the extension area of ​​the liquid tank (1) via a spring and a guide shaft.

3. The release film assembly (3) is a mounting substrate (101); Linear guide rails (102, 103) fixed on a mounting substrate (101) along a first direction in which a print platform (2) moves between a main body region and an extension region of a liquid tank (1); a release film holder assembly that can move along a first direction by being driven by a release film drive assembly attached on the linear guide rails (102, 103), the release film holder assembly having a release film attachment jig member (500), and a release film attached to the release film attachment jig member (500); 2. The conveniently operable 3D printing device of claim 1, comprising:

4. The release film holder assembly includes: a transmission frame (109) connected to the linear guide rails (102, 103) via first slide blocks (122, 124); Release film level adjustment columns (110, 111, 112) fixed to the transmission frame (109); a horizontal adjustment frame (113) connected to the release film horizontal adjustment columns (110, 111, 112) via release film horizontal adjustment knobs (120, 121), and to which the release film tensioning jig member (500) is attached; 4. The conveniently operable 3D printing device of claim 3, comprising:

5. The release film drive assembly a first step motor (105) fixed to the bottom of the mounting substrate (101); and a first synchronous belt (107) connected to the first step motor (105) and to the transmission frame (109) to drive the transmission frame (109).

6. 4. The conveniently operable 3D printing device according to claim 3, further comprising limit stoppers (108) on the mounting substrate (101), the limit stoppers (108) being arranged at the four corners of the mounting substrate (101) to prevent the movement of the transmission frame (109) from exceeding the movement limit.

7. 5. The 3D printing device according to claim 4, further comprising a position sensor (114) mounted on the mounting substrate (101), the sensor (114) being attached to one edge of the mounting substrate (101) and used to sense the position of the transmission frame (109), and the lateral movement position of the release film application jig member (500) is limited by the position sensor (114).

8. The hob drive assembly includes: a second step motor (104) fixed to the bottom of the mounting substrate (101); and a second synchronous belt (106) connected to the second step motor (104) and to a hob holder assembly movably mounted on the linear guide rails (102, 103), for driving the hob holder assembly.

9. The hob holder assembly includes: a transmission connecting rod (115) connected to the linear guide rails ((102), (103)) via a second slide block (123); a rear hob leveling support (116) and a front hob leveling support (117) attached to both sides of the transmission connecting rod (115), The connection points of the rear hob level adjustment column (116), the front hob level adjustment column (117) and the transmission connecting rod (115) are adjusted by the rear hob level adjustment knob (118) and the front hob level adjustment knob (119), respectively. The 3D printing device according to claim 8, characterized in that the upper portions of the rear hob leveling support (116) and the front hob leveling support (117) are connected to the leveling hob body (300).

10. A 3D printing method using the 3D printing apparatus according to any one of claims 1 to 9, in which a liquid is extruded horizontally using a release film to coat the liquid, Step S1: moving the release film and leveling hob assembly to the stretching area and attaching the print platform (2) to the body area of ​​the liquid tank (1); Step S2: Control the release film to move to the main body area, control the print platform (2) to move up and down to the print waiting position, ensure that the distance between the print platform (2) and the lower surface of the release film is one layer thickness, and wait for leveling; Step S3: The release film is held so as not to move, and the leveling hob assembly starts to move toward the main body region of the liquid tank (1), and stops after moving to the left or right edge of the release film; Step S4: holding the release film so that it does not move, and moving the leveling hob assembly to the other edge of the release film; Step S5: repeating steps S3 and S4 until the bulge in the release film is removed; Step S6: focusing the pattern on the release film by a UV lens (8), and performing exposure and curing to obtain a cured pattern; Step S7: Controlling the print platform (2) to descend and separating the cured print sample (7) from the release film; Step S8: controlling the release film and leveling hob assembly to move laterally to the stretching area of ​​the liquid tank (1), and then controlling the bubble scraper (5) to rise and come into close contact with the lower surface of the release film; Step S9: controlling the release film and leveling hob assembly to move laterally to the main body area of ​​the liquid tank (1), and simultaneously scraping out bubbles on the lower surface of the release film using the bubble scraper (5), and then controlling the bubble scraper (5) to descend; Step S10: repeating steps S2 to S9 until the printing of the sample is completed; Step S11: removing the print platform (2) carrying the print sample (7) by controlling the release film and leveling hob assembly to move laterally to the drawing area of ​​the liquid tank (1); A method comprising:

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