A 3D printed support and a 3D printed piece

Abstract

The application discloses a 3D printing support and a 3D printing piece. At least one end of the 3D printing support is connected with the printing piece; after a combination formed by the support and at least part of the printing piece is divided into multiple layers of parallel slices, all the slices between each layer of the slices and an initial printing slice form a sub-combination; and a connecting line of the gravity centers of each sub-combination is located in a first column space vertical to any slice.

Description

[0001] CLAIM OF PRIORITY

[0002] This application claims priority to the Chinese application with the application number 201821549720.3, which was filed on September 21, 2018. TECHNICAL FIELD

[0003] The present application relates to the technical field of 3D printing, in particular to a 3D printing support, a 3D printing piece, a 3D printing support construction method and a 3D printing method. BACKGROUND

[0004] The technical principle of 3D printing is to first divide a three-dimensional model into layers, then obtain the contour information or image information of each layer, and then use powder-like metal or resin and other adhesive materials to complete the printing of the printed piece through layer-by-layer printing.

[0005] Since 3D printing is a process of layer-by-layer solidification of materials, the upper structure of the model generally requires support from the lower part in principle. Therefore, if some parts of the printed piece are suspended, a support is usually designed to support these suspended parts of the printed piece. In particular, in the process of constraint liquid surface type (bottom up) photocuring 3D printing, the light source irradiates from below the resin tank to the top, the photocuring starts from the bottom, and the forming table carrying the solidified printed piece moves from bottom to top. After completing a layer of solidification, the forming table moves up by one layer of height. In this type of photocuring printing process, the printed piece attached to the forming table will be affected by gravity and will shake or even deviate. SUMMARY

[0006] One of the embodiments of the present application provides a 3D printing support. At least one end of the support is connected to a printed piece; the combination of the support and at least part of the printed piece is divided into multiple parallel slices, and all the slices between each slice and the initial printing slice form a sub-combination; the connecting line of the center of gravity of each sub-combination is located in a first column space perpendicular to any slice.

[0007] In some embodiments, the connecting line of the center of gravity of each sub-combination is perpendicular to any slice.

[0008] In some embodiments, the support includes a main body part and a connecting part connected to the printed piece, and the cross-sectional area of the end of the connecting part connected to the printed piece is smaller than the area of the main body part.

[0009] In some embodiments, the support includes a columnar support, a sheet-shaped support and / or a net-shaped support.

[0010] In some embodiments, the sheet-shaped support is provided with one or more through holes extending along the thickness direction thereof.

[0011] In some embodiments, the connecting part of the sheet-shaped support connected to the printed part is sawtooth-shaped.

[0012] In some embodiments, the net-shaped support comprises a plurality of unit structures composed of struts; the unit structures comprise at least one of the following structures: tetrahedron, cube, cuboid, octahedron, dodecahedron, icosahedron.

[0013] In some embodiments, both ends of the support are connected to the printed part.

[0014] Another embodiment of the present application provides a 3D printed part, which adopts the support according to any one of the above technical solutions during printing.

[0015] In some embodiments, the printed part comprises at least two sub-printed parts.

[0016] In some embodiments, the at least two sub-printed parts are the same; the at least two sub-printed parts are arranged in rotational symmetry.

[0017] Yet another embodiment of the present application provides a 3D printed support construction method, which comprises: obtaining a printed part model; constructing a support for the printed part model, at least one end of the support being connected to the printed part, the combined body formed by the support and at least part of the printed part being divided into a plurality of parallel slices after the division, all the slices between each slice and the initial printing slice constituting a sub-combined body, and the connecting line of the centers of gravity of each sub-combined body being located in a first column space perpendicular to any slice.

[0018] In some embodiments, the support comprises a main body part and a connecting part connected to the printed part, the cross-sectional area of the connecting part connected to one end of the printed part being smaller than the cross-sectional area of the main body part.

[0019] Still another embodiment of the present application provides a 3D printing method, which comprises: constructing a support for a printed part model according to the 3D printed support construction method of any one of the above technical solutions; and printing the printed part and the support by using a 3D printing device. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described in the manner of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, the same reference numbers represent the same structures, wherein:

[0021] Figure 1Fig. 1 is a schematic diagram of the connection between a 3D printing support and a printed part according to some embodiments of the present application;

[0022] Figure 2 Fig. 2 is a schematic diagram of the structure of a sheet-shaped support of a 3D printing support according to some embodiments of the present application;

[0023] Figure 3 Fig. 3 is a schematic diagram of the structure of a mesh-shaped support of a 3D printing support according to some embodiments of the present application;

[0024] Figure 4 Fig. 4 is a schematic diagram of the structure of a sub-printed part and a support according to some embodiments of the present application;

[0025] Figure 5 Fig. 5 is a flow chart of a 3D printing support construction method according to some embodiments of the present application.

[0026] In the figure, 1 is a printed part, 2 is a support, 10 is a sub-printed part, 21 is a sheet-shaped support, 22 is a mesh-shaped support, 201 is a main body, 202 is a connecting part, and 221 is a unit structure. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0028] On the contrary, the present application covers any alternative, modification, equivalent method and solution defined by the claims on the essence and scope of the present application. Further, in order to make the public better understand the present application, some specific details are described in detail in the following detailed description of the present application. The present application can also be completely understood without the description of these details by those skilled in the art.

[0029] The embodiments of the present application mainly relate to a 3D printing support which can be applied to various scenarios. In some embodiments, the support can be a support during the 3D printing design process, a support during the printing process and / or a support after the printing is completed. The present application also relates to a 3D printed object using the 3D printing support during printing, which can be a 3D printed article applied in medical, industrial, life and artistic fields. The present application also relates to a 3D printing support construction method and a 3D printing method. Those skilled in the art can use the 3D printing support construction method on software such as Rhino, Solidworks, Catia or UG to realize the construction of the 3D printing support, and complete the printing through various 3D printing devices. The application scenarios of the 3D printing support, the 3D printed object, the 3D printing support construction method and the 3D printing method are not limited.

[0030] In the embodiments of the present application, at least one end of the 3D printing support 2 is connected with the printed object 1, and the combination of the support 2 and at least part of the printed object 1 is divided into multiple parallel slices, and all the slices between each slice and the initial printing slice constitute a sub-combination; the connecting line of the centers of gravity of each sub-combination is located in a first column space perpendicular to any slice. At least one end of the support 2 can be connected with the 3D printing forming table, and the other end can be connected with the printed object 1; or both ends of the support 2 can be connected with the printed object 1. Figure 1 is a schematic view of the connection between the 3D printing support and the printed object according to some embodiments of the present application, in which Figure 1 In the embodiments shown in the figure, both ends of the support 2 are connected with the printed object 1.

[0031] In the embodiments of the present application, the first column being perpendicular to any slice means that the central axis of the first column is perpendicular to any slice. In some embodiments, the first column can include but is not limited to a cylinder, a triangular prism, a quadrangular prism, a hexagonal prism, etc. In some embodiments, the size of the first column can be set according to specific conditions (such as the size of the printed object). For example, when the first column is a cylinder, the diameter of the first column can be set to 0.1-50 mm (such as 0.1 mm, 0.5 mm, 1 mm, 5 mm, 10 mm, etc.). In some embodiments, the connecting line of the centers of gravity of each sub-combination being located in the first column space can be understood as the connecting line of the centers of gravity of each sub-combination being perpendicular or approximately perpendicular to any slice. In some embodiments, the combination can be formed integrally by the support 2 and the printed object 1. In some embodiments, the combination can also be formed by the support 2 and part of the printed object 1. For example, the part of the printed object can be the part of the printed object containing the support after being divided into slices. In some embodiments, the initial printing slice can be understood as the first layer of slice printed by the printed object 1 during printing.

[0032] In some embodiments, the operation of ensuring that the line connecting the centers of gravity of each sub-assembly is perpendicular to any slice in the first column space can be embedded in the form of a program in the construction software of the support, so that it can be called or adopted by default when the support is constructed by using the software. In addition, the division of the assembly into multiple parallel slices can be implemented during modeling, during printing, and / or after printing is completed. It should be noted that the multiple slices in which the assembly is divided are generally parallel to the forming table of 3D printing, so as to facilitate the smooth progress of the 3D printing process. The specific structure of the support 2 is determined according to the shape of the printed part 1, and the construction of the specific structure of the support 2 can be automatically completed by a software algorithm (such as Grasshopper) or manually designed and adjusted. In some embodiments, in order to further prevent the printed part from shaking during 3D printing, the line connecting the centers of gravity of each sub-assembly can be made perpendicular to any slice.

[0033] In some embodiments, the 3D printing support 2 can include a columnar support, a sheet-shaped support 21, and / or a mesh-shaped support 22. In Figure 2 and Figure 3 In the embodiments shown in FIGS. 17 and 18, Figure 2 is a structural schematic diagram of a sheet-shaped support of a 3D printing support according to some embodiments of the present application, Figure 3 is a structural schematic diagram of a mesh-shaped support of a 3D printing support according to some embodiments of the present application. The support 2 can include any combination of one or more of a columnar support, a sheet-shaped support 21, and a mesh-shaped support 22, and a person skilled in the art can specifically set it according to the needs in the actual operation, which is not limited in the present application. In some embodiments, when the 3D printing support 2 includes a sheet-shaped support 21, the sheet-shaped support 21 can include one plane or multiple planes that are not parallel to each other, and the design of the one or more planes of the sheet-shaped support 21 can make the line connecting the centers of gravity of each sub-assembly perpendicular or approximately perpendicular to any slice, so as to better maintain the stability of the printed part 1 during 3D printing. In other embodiments, the sheet-shaped support 21 can also include one or more curved surfaces.

[0034] In some embodiments, the support 2 can include a main body part 201 and a connecting part 202 connected with the printed part 1, and the cross-sectional area of the end of the connecting part 202 connected with the printed part 1 is smaller than that of the main body part 201. Specifically, the connecting part 202 is connected between the main body part 201 and the printed part 1, the main body part 201 is used to support the printed part 1, the main body part 201 is not connected with the printed part 1, and the connecting part 202 connects the main body part 201 with the printed part 1, and the support 2 is removed from the printed part 1 after printing by changing the cross-sectional area. In this way, the support 2 can be separated from the printed part 1 after printing, preventing excessive support 2 material from remaining on the printed part 1 and affecting the normal use of the printed part 1, and ensuring the aesthetics of the printed part 1. When the shape of the main body part 201 is different, those skilled in the art can use various design forms to ensure that the cross-sectional area of the end of the connecting part 202 connected with the printed part 1 is smaller than that of the main body part 201. For example, when the support 2 includes a columnar support, the main body part 201 can include one or more support columns, and the connecting part 202 can include connecting columns connected between the one or more support columns and the printed part 1. The cross-sectional area of the connecting column can be set to be smaller than that of the support column. For another example, the connecting part 202 can be in the shape of a pyramid, a cone or a circular truncated cone, and the end of the connecting part with a smaller cross-sectional area is connected with the printed part 1, and the end of the connecting part with a larger cross-sectional area is connected with the support column. For another example, when the support 2 includes a mesh support 22, the main body part 201 can include a plurality of support columns constituting a mesh, and the connecting part 202 can include connecting columns connected between the support columns and the printed part 1. The cross-sectional area of the connecting column can be set to be smaller than that of the support column, or the connecting column can be in the shape of a pyramid, a cone or a circular truncated cone, and the end of the connecting column with a smaller cross-sectional area is connected with the printed part 1, and the end of the connecting column with a larger cross-sectional area is connected with the support column.

[0035] In some embodiments, when the support 2 includes a sheet-shaped support 21, the main body part 201 can include a support sheet, and the connecting part 202 can include a sawtooth structure or a plurality of spaced connecting columns connected between the support sheet and the printed part 1. As shown in FIG. 2B, the connecting part 202 can include a plurality of spaced connecting columns 2021 connected between the support sheet 2011 and the printed part 1. The cross-sectional area of the connecting column 2021 can be set to be smaller than that of the support column 2011. For another example, the connecting part 202 can include a sawtooth structure connected between the support sheet 2011 and the printed part 1. As shown in FIG. 2C, the connecting part 202 can include a sawtooth structure 2022 connected between the support sheet 2011 and the printed part 1. The sawtooth structure 2022 can be in the shape of a pyramid, a cone or a circular truncated cone, and the end of the sawtooth structure 2022 with a smaller cross-sectional area is connected with the printed part 1, and the end of the sawtooth structure 2022 with a larger cross-sectional area is connected with the support sheet 2011. Figure 2As shown, the connecting part 202 of the sheet-shaped support 21 connecting with the printing part 1 is in a sawtooth shape, the smaller cross-sectional area end of the sawtooth-shaped connecting part 202 is connected with the printing part 1, and the larger cross-sectional area end is connected with the support sheet. In some alternative embodiments, the connecting part 202 of the sheet-shaped support 21 connecting with the printing part 1 can include a connecting column in a pyramid shape, a conical shape, a circular truncated cone shape, etc., and the smaller cross-sectional area end of the connecting column in the pyramid shape, the conical shape, the circular truncated cone shape, etc. is connected with the printing part 1, and the larger cross-sectional area end is connected with the support sheet. In some embodiments, the connecting part 202 can also be a continuous linear or strip-shaped structure, and the connecting part 202 and the main body part 201 jointly form a complete sheet-shaped support 21. In some embodiments, the thickness of the sheet-shaped support 21 can be selected to be 0.1-10 mm.

[0036] In some embodiments, when the 3D printing support 2 includes a sheet-shaped support 21, in order to reduce the material of the support 2, one or more through holes extending along the thickness direction of the sheet-shaped support 21 can be provided. The through hole can be any shape, such as a circular hole, a square hole, a triangular hole, or other irregularly shaped holes, etc. If the through hole is a circular hole, the diameter of the through hole can be selected to be 1-10 mm. In some alternative embodiments, blind holes, buried holes, or grooves can also be provided on the sheet-shaped support column to reduce the material of the support 2.

[0037] In some embodiments, when the 3D printing support 2 comprises a lattice support 22, the lattice support 22 comprises a plurality of unit structures 221 formed by struts. The unit structures 221 can comprise any combination of one or more of tetrahedron, cube, cuboid, octahedron, dodecahedron, icosahedron, etc. The plurality of struts of each unit structure 221 defines the basic geometric shape of the unit structure 221. One skilled in the art can determine the diameter of the struts (e.g., 2mm, 3mm, or 4mm, etc.) and / or the size of the unit structures according to the structural strength required by the lattice support 22. In some alternative embodiments, the unit structures 221 of the support 2 can also comprise a plurality of two-dimensional lattice cell units formed by struts, which can be in the shape of triangle, quadrilateral, and / or hexagon, etc. In some embodiments, one skilled in the art can also provide a lattice support 22 having both two-dimensional grid and three-dimensional polyhedral unit structures 221. The use of the lattice support 22 can reduce the material usage of the support 2 while ensuring the support strength of the support 2, thereby ensuring that the support 2 can more stably support the printed part 1 during the printing process. In addition, the lattice support 22 facilitates changing the center of gravity of each sub-assembly by changing the shape and size of the unit structures 221, thereby ensuring that the line connecting the center of gravity of each sub-assembly is perpendicular or approximately perpendicular to any slice. Especially when applied to support a printed part 1 with irregular shape, the structure of the support 2 can be adjusted by changing the shape and size of the unit structures 221, thereby facilitating the adjustment of the center of gravity of each sub-assembly of the assembly.

[0038] The 3D printing support disclosed in the present application can have beneficial effects including but not limited to: (1) preventing the printed part 1 from shaking during the 3D printing process, reducing printing deviation, and improving printing accuracy; (2) reducing the material usage of the support, thereby reducing the printing cost; (3) facilitating the separation of the support from the printed part after printing, thereby reducing material residues on the printed part. It should be noted that different embodiments can have different beneficial effects, and in different embodiments, the beneficial effects can be any one or a combination of the above, or any other beneficial effects that can be obtained.

[0039] Another embodiment of the present application provides a 3D printed part. The printed part 1 uses the support 2 of any of the above technical solutions during printing. Through the arrangement of the support, the printed part is less likely to shake during the printing process, and the printing deviation can be reduced as much as possible to improve the printing precision. For example, for the constraint liquid surface (bottom up) photocuring 3D printing technology, since photocuring starts from the bottom of the resin tank, after completing each layer of curing, the forming table carrying the cured printed part moves up by one layer of height. The entire printing process requires the forming table to constantly move upwards, and the printed part attached to the forming table will be affected by gravity and uncured liquid (such as photosensitive resin). The forming table moving upwards after completing each layer of printing can cause the printed part to shake, and even cause printing deviation. When the material for photocuring 3D printing is an elastomer material, the problem of printed part shaking caused by the upward movement of the forming table will be particularly prominent. Elastomer materials generally have a low Young's modulus and a high breaking strain, and can deform greatly under stress, but can quickly recover to their approximate initial shape and size after the external force is removed. Elastomer materials can include, but are not limited to, rubber, thermoplastic polyurethane, etc. The 3D printed part and the 3D printing support involved in the embodiments of the present application can be printed from an elastomer material. The 3D printed part 1 uses the support 2 of any of the above technical solutions, which can ensure that the center of gravity of the combination of the printed part 1 and the support 2 is on a straight line perpendicular or approximately perpendicular to the slice when the forming table moves upwards after completing each layer of printing, thereby ensuring that the printed part is less likely to shake during the printing process.

[0040] Figure 4 is a structural schematic diagram of a sub-printed part and a support of a 3D printed part according to some embodiments of the present application, in which Figure 4 In the embodiments shown, the printed part 1 includes at least two sub-printed parts 10. The 3D printing support 2 of any of the above technical solutions can be connected between adjacent two sub-printed parts 10. At this time, the support 2 can be connected with the forming table of 3D printing, or can not be connected with the forming table of 3D printing. At least two sub-printed parts 10 are printed simultaneously during the 3D printing process, and the support 2 can support and / or connect each sub-printed part 10, and each printed part 1 can remain relatively stable. Especially for sub-printed parts 10 that are difficult to be placed stably alone, each sub-printed part 10 can support each other through the support 2 to reduce shaking during the printing process.

[0041] In some embodiments, at least two sub-printed parts 10 are the same, and at least two sub-printed parts 10 are arranged in rotational symmetry. For example, two sub-printed parts can be arranged in 180° rotational symmetry, as shown in Figure 4For example, three sub-printed parts can be arranged in 120° rotational symmetry. Through such an arrangement, firstly, the production efficiency of the sub-printed part 10 can be improved, and secondly, in each layer slice, the printed part 1 itself is a symmetrical structure, which facilitates the design of the structure of the support part 2. For example, the support part can be designed such that the center of gravity of each layer slice is located at the center of rotation. For example, the support part in each layer slice can also be rotationally symmetrical about the center of rotation of the layer slice. In some alternative embodiments, at least two sub-printed parts 10 can also include other arrangements (such as axial symmetry arrangement).

[0042] Another embodiment of the present application provides a 3D printed support part construction method, Figure 5 is a flow chart of a 3D printed support part construction method according to some embodiments of the present application, as shown in Figure 5 The construction method can include: obtaining a printed part 1 model; constructing a support part 2 for the printed part 1 model, at least one end of the support part 2 being connected to the printed part 1, and the combined body formed by the support part 2 and at least part of the printed part 1 being divided into multiple parallel layer slices, each layer slice and the initial printed slice forming a sub-combined body, and the connecting line of the center of gravity of each sub-combined body being located in a first column space perpendicular to any slice. In some embodiments, the process of constructing a support part 2 for a printed part 1 model can include: constructing a support part 2 connected to the printed part 1 at least at one end for the printed part 1; dividing the combined body of the support part 2 and the printed part 1 into multiple parallel layer slices parallel to the forming table of 3D printing according to a certain layer thickness (such as 0.1 mm, 0.15 mm, or 0.2 mm, etc.); calculating the center of gravity position of each sub-combined body, and adjusting the structural shape of the support part 2 according to the center of gravity position, so that the connecting line of the center of gravity of each sub-combined body is located in a first column space perpendicular to any slice. It should be noted that at least one end of the support part 2 connected to the printed part 1 can be understood as: one end of the support part is connected to the forming table, and the other end is connected to the printed part 1; or both ends of the support part are connected to the printed part 1. The construction of the printed part 1 model can be realized by Rhino, Solidworks, Catia, or UG software. The construction of the support part 2 can be determined according to the shape of the printed part 1. The specific structural construction of the support part 2 can be automatically completed by software algorithm (such as Grasshopper), or can be designed and adjusted by manual operation.

[0043] In some embodiments, the support 2 can include a main body part 201 and a connecting part 202 connected with the printed part 1, the cross-sectional area of the end of the connecting part 202 connected with the printed part 1 is smaller than that of the main body part 201. Specifically, the connecting part 202 is connected between the main body part 201 and the printed part 1, the main body part 201 is used to support the printed part 1, and the connecting part 202 connects the main body part 201 with the printed part 1, and the change of the cross-sectional area ensures that the whole support 2 is easy to be removed from the printed part 1 after the printing is completed. In some embodiments, the support 2 can include one or more of a columnar support, a sheet-shaped support 21 and a mesh-shaped support 22, etc.

[0044] The 3D printing support construction method disclosed in the present application can bring the beneficial effects including but not limited to: (1) a suitable support 2 can be constructed to prevent the printed part 1 from shaking as much as possible during the 3D printing process, and reduce the printing deviation; (2) the constructed support 2 can reduce the material usage and printing cost; (3) the constructed support 2 is easy to separate from the printed part 1 after the printing is completed, thereby reducing the material residue of the support 2 on the printed part 1. It should be noted that different embodiments can have different beneficial effects, and in different embodiments, the beneficial effects that can be produced can be any one or a combination of the above, or any other beneficial effects that can be obtained.

[0045] Another embodiment of the present application provides a 3D printing method, the printing method comprising: constructing a support 2 for a printed part 1 model according to the 3D printing support construction method of any of the above technical solutions; and printing the printed part 1 and the support 2 by using a 3D printing device. The 3D printing device for printing the printed part 1 and the support 2 can be a light-curing 3D printer. By using the above 3D printing support construction method to perform the preliminary modeling for 3D printing, the support 2 and the printed part 1 are constructed, which can reduce the shaking of the printed part 1 during the process of printing the printed part 1 and the support 2 by using the 3D printing device, thereby making the printed printed part 1 have high precision.

[0046] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A 3D printing support, characterized in that, At least one end of the support is connected to the printed part; After the combination of the support and at least part of the printed part is divided into multiple parallel slices, all the slices between each slice and the initial printed slice form a sub-combination; At least one sub-combination includes at least part of the support and at least part of the printed part; The connecting line of the center of gravity of each sub-combination is located in a first column space perpendicular to any slice; The first column is a cylinder, and the diameter of the first column is set to 0.1-50 mm.

2. The 3D printing support of claim 1, wherein, The connecting line of the center of gravity of each sub-combination is perpendicular to any slice.

3. The 3D printing support of claim 1, wherein, The support includes a main body part and a connecting part connected to the printed part, and the cross-sectional area of the end of the connecting part connected to the printed part is smaller than the cross-sectional area of the main body part.

4. The 3D printing support of claim 1, wherein, The support includes a columnar support, a sheet-shaped support, and / or a net-shaped support.

5. The 3D printing support of claim 4, wherein, The sheet-shaped support is provided with one or more through holes extending in the thickness direction thereof.

6. The 3D printing support of claim 4, wherein, The connecting part of the sheet-shaped support connected to the printed part is zigzag-shaped.

7. The 3D printing support of claim 4, wherein, The net-shaped support includes a plurality of unit structures composed of struts; The unit structure includes at least one of the following structures: tetrahedron, cube, cuboid, octahedron, dodecahedron, and icosahedron.

8. The 3D printing support of claim 1, wherein, Both ends of the support are connected to the printed part.

9. A 3D printed piece, characterized in that, The printed part uses the support according to any one of claims 1-8 during printing.

10. The 3D printed piece of claim 9, wherein, The printed part includes at least two sub-printed parts.

11. The 3D printed piece of claim 10, wherein, The at least two sub-printed parts are the same; The at least two sub-printed parts are arranged in rotational symmetry.

12. A method for constructing a 3D printed support component, characterized in that, Including: Obtaining a printed part model; Constructing a support for the printed part model, at least one end of the support being connected to the printed part, the combination of the support and at least part of the printed part being divided into multiple parallel slices, all the slices between each slice and the initial printed slice forming a sub-combination, the connecting line of the center of gravity of each sub-combination being located in a first column space perpendicular to any slice, and at least one sub-combination including at least part of the support and at least part of the printed part; The first column is a cylinder, and the diameter of the first column is set to 0.1-50 mm.

13. The 3D printed support member building method of claim 12, wherein, The support includes a main body part and a connecting part connected to the printed part, and the cross-sectional area of the end of the connecting part connected to the printed part is smaller than the cross-sectional area of the main body part.

14. The 3D printing support member building method according to claim 12, wherein The support includes a columnar support, a sheet-shaped support, and / or a net-shaped support.

15. A method of 3D printing, characterized in that, Including: The 3D printing support construction method according to any one of claims 12-14 is used to construct a support for a printed part model; The printed part and the support are printed using a 3D printing device.

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