CN111805895A - Large-size photocuring 3D printing method and printer - Google Patents
Large-size photocuring 3D printing method and printer Download PDFInfo
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- CN111805895A CN111805895A CN202010750576.5A CN202010750576A CN111805895A CN 111805895 A CN111805895 A CN 111805895A CN 202010750576 A CN202010750576 A CN 202010750576A CN 111805895 A CN111805895 A CN 111805895A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/214—Doctor blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/227—Driving means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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Abstract
The invention discloses a large-size photocuring 3D printing method and a printer, wherein the method comprises the following steps: importing a model file; converting the model file into a printing file; pouring liquid photosensitive resin into a photosensitive resin material cylinder; guiding the printed file into a photocuring 3D printer; the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, and splicing and projecting a layer of plane of the 3D model to form projection of a single-layer whole plane of the 3D model; curing the photosensitive resin material cylinder of the current layer; the printing platform lifting mechanism descends to set the thickness, and the scraper moving mechanism drives the scraper to scrape the liquid photosensitive resin material flat; the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, the 3D model is spliced and projected on the plane of the current layer to form projection of the whole single-layer plane of the 3D model, the photosensitive resin material cylinder on the current layer is cured, and the like until the 3D model is printed.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a large-size photocuring 3D printing method and a printer.
Background
The photocuring 3D printing technology is the oldest 3D printing technology in history, and is favored by the 3D printing industry due to the advantages of high printing precision, good surface smoothness and the like. In recent years, with the progress of material science, various functional liquid photosensitive resin materials with different functions are developed, the printing precision and speed of the materials are greatly improved, and therefore, the photocuring 3D printing technology is receiving more and more attention.
At present, the mainstream photocuring 3D printing principle is as follows: and (3) scanning point by using laser and a vibrating mirror, curing and forming layer by layer, using a fixed DLP (digital light processing) projection machine to perform whole-surface projection layer by layer, and using a fixed LCD (liquid crystal display) screen to perform whole-surface projection layer by layer.
The laser and the galvanometer are used for scanning point by point and curing the molding principle layer by layer, the laser and galvanometer printing device has the advantages of being capable of printing a large-size photocuring model and has the defects of high control difficulty, low printing speed, great influence of optical distortion and the like due to the use of expensive lasers and galvanometers, and still is the molding principle of the current mainstream industrial photocuring 3D printer.
The integral projection layer-by-layer curing forming principle of the fixed DLP projection machine has the advantages that the printing precision is the best in the current mainstream photocuring 3D printing principle, the single-layer printing speed is the fastest, the control difficulty is lower, the hardware cost is relatively low, and the defects that the printing size is smaller and a large-size model cannot be printed due to the DLP digital chip resolution.
The fixed liquid crystal display full-surface projection layer-by-layer curing forming principle has the advantages of very low hardware cost, lower control difficulty, better printing precision, low printing speed, very short service life of the liquid crystal display, high loss and unstable printing effect, and the defects of being limited by the resolution of the liquid crystal display, small in printing size, incapable of printing large-size models and low in printing speed.
In summary, how to provide a photocuring 3D printer with high printing precision, large printing size and high printing speed is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a large-size photocuring 3D printing method and a printer, and aims to solve the problems.
According to a first aspect of embodiments of the present application, there is provided a large-size photocuring 3D printing method for a photocuring 3D printer, the photocuring 3D printer including: the device comprises a DLP (digital light processing) projection optical machine, a plane moving assembly, a scraper moving assembly, a printing platform lifting mechanism and a photosensitive resin material cylinder, wherein the DLP projection optical machine is arranged on the plane moving assembly; the large-size photocuring 3D printing method comprises the following steps: importing a model file; converting the model file into a print file; pouring liquid photosensitive resin into the photosensitive resin material cylinder; importing the printing file into the photocuring 3D printer; the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, and splicing and projecting a layer of plane of the 3D model to form projection of a single-layer whole plane of the 3D model; curing the photosensitive resin material cylinder of the current layer; the printing platform lifting mechanism descends to set thickness, and the scraper moving mechanism drives the scraper to scrape the liquid photosensitive resin material flat; the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, the current-layer plane of the 3D model is spliced and projected to form the projection of the single-layer whole plane of the 3D model, the current-layer photosensitive resin material cylinder is cured, and the like until the 3D model is printed.
In the large-size photocuring 3D printing method, the stitching projection is a continuous stitching projection or an intermittent stitching projection.
In the large-sized photocuring 3D printing method of the present invention, the mode of the model file includes any one of STL format, OBJ format, SLC format.
In the large-size photocuring 3D printing method, the DLP projector adopts a digital micromirror wafer as a main key processing element to realize a digital optical processing process, firstly, image signals are subjected to digital processing, and then light is projected; wherein the projected white area is a cured area and the black area is an uncured area.
In the large-size photocuring 3D printing method of the present invention, the specific method of the continuous stitching projection is:
the single-layer projection graph is output as a graph with ultrahigh resolution A x B and is paved on the whole printing area, and the maximum graph resolution of one-time projection of the DLP projection optical machine is fixed as a x B, so that the DLP projection optical machine updates the projection picture once every 1 pixel is moved in the moving process, and the A x B small graphs with the a x B resolution are continuously moved and spliced into the graph of A x B in the printing area.
In the large-size photocuring 3D printing method of the present invention, the method of intermittently stitching projection is: the single-layer projection graph is output as a graph with ultrahigh resolution A x B and is paved on the whole printing area, and the maximum graph resolution of one-time projection of the DLP projection optical machine is fixed as a x B, so that the DLP projection optical machine updates the projection picture once every a pixels are moved, and the A x B small graph gap motions with a x B resolution are spliced into the graph of A x B in the printing area.
According to a second aspect of the embodiments of the present application, there is provided a photocuring 3D printer, which adopts the above-mentioned large-size photocuring 3D printing method.
The technical scheme provided by the embodiment of the application can have the following beneficial effects: the application designs a jumbo size photocuring 3D printing method, has adopted DLP projection ray apparatus to through the whole size of the every layer of motion concatenation projection play model, this application printing precision is high, print the size big, print fastly, stable durable, the price is suitable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic partial structure diagram of a photocuring 3D printer according to an embodiment of the invention
FIG. 2 is a schematic structural diagram of a planar motion assembly according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a doctor blade motion assembly of an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a printing platform lifting mechanism according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of continuous motion splicing projection of a DLP projector according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an intermittent movement splicing projection of a DLP projector according to an embodiment of the present invention;
fig. 7 is a schematic workflow diagram of an embodiment of the present invention.
Description of reference numerals:
1. DLP projection light machine; 2. a planar moving assembly; 21. an X-axis motion guide rail; 22. an X-axis motion slide block;
23. a planar moving assembly; 24. a Y-axis motion slide block; 3. a scraper movement assembly; 31. a scraper movement guide rail;
32. a scraper moving slide block; 32. a scraper; 4. a photosensitive resin material cylinder; 5. print platform elevating system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 to 7, the invention discloses a large-size photocuring 3D printing method, which is used for a photocuring 3D printer, wherein the photocuring 3D printer comprises a DLP projection machine 1, a plane moving assembly 2, a scraper moving assembly 3, a printing platform lifting mechanism 5 and a photosensitive resin material cylinder 4, and the DLP projection machine is arranged on the plane moving assembly, so that the plane moving assembly can drive the DLP projection machine to move on a plane, namely, the DLP projection machine can be driven to move on an X axis and a Y axis. The blade moving assembly 3 includes a blade 33 which carries the blade to scrape the resin. The large-size photocuring 3D printing method provided by the application comprises the steps S101-S107.
And S101, importing the model file.
The model file is a 3D file, and before the model file is used, a user firstly imports the 3D file of the model to be printed into a photocuring 3D printer so as to carry out the next operation.
And S102, converting the model file into a printing file.
After a user imports the 3D file into the photocuring 3D printer, slicing software in the photocuring 3D printer can perform operations such as typesetting, editing, parameter setting, slicing and the like on the model file, and therefore the model file is converted into a printing file which can be identified by the photocuring 3D printer.
S103, importing the printing file into the photocuring 3D printer.
Specifically, after the slicing software converts the model file into an identifiable print file, the file is stored in a U disk, and then the U disk is inserted into a data reading interface of the photocuring 3D printer.
And S104, pouring liquid photosensitive resin into the photosensitive resin material cylinder.
S105, the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, and a layer of plane of the 3D model is spliced and projected to form a single-layer whole plane projection of the complete 3D model; and curing the photosensitive resin material cylinder of the current layer.
And S106, the printing platform lifting mechanism descends to set the thickness, and the scraper moving mechanism drives the scraper to scrape the liquid photosensitive resin material.
And S107, the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, splicing and projecting the current-layer plane of the 3D model to form a projection of the single-layer whole plane of the 3D model, curing the current-layer photosensitive resin material cylinder, and so on until the 3D model is printed. After the projection of the DLP optical projection engine in this embodiment is completed at one position, the DLP optical projection engine is moved in the X-axis and Y-axis directions of the plane, and then the DLP optical projection engine is projected at another position until the projection of the single-layer complete pattern of the model is completed, and then the single-layer curing is performed. By the method, a model with a larger size can be printed, and compared with other forming printing modes, the DLP projection light machine printing mode has the advantages of high printing speed and low printing difficulty.
In an alternative embodiment, the stitching projection is a continuous stitching projection or an intermittent stitching projection. The whole graphic projection of the model single layer can be finished no matter in connection splicing projection or intermittent splicing projection.
As shown in fig. 2, the plane movement assembly includes an X-axis movement guide 21, an X-axis movement slider 22, a Y-axis movement guide 23, and a Y-axis movement slider 24; wherein the X-axis movement sliding block 22 is arranged on the X-axis movement guide rail 21, the Y-axis movement sliding block 24 is arranged on the Y-axis movement guide rail 23, and the Y-axis movement guide rail 23 is arranged on the X-axis movement sliding block 22.
As shown in fig. 3, the blade moving assembly 3 includes a blade moving rail 31 and a blade moving slider 32, wherein the blade moving slider 32 is mounted on the blade moving rail 31, and the blade 33 is mounted on the blade moving slider 32.
As shown in fig. 4, the printing platform lifting structure 4 includes a platform lifting guide 51, a platform lifting slider 52, a platform pallet 53 and a multi-hole printing platform 54; wherein the platform lifting slide block 52 is arranged on the platform lifting guide rail 51, the platform supporting plate 53 is arranged on the platform lifting slide block 52, and the multi-hole printing platform 54 is arranged on the platform supporting plate 53.
In an alternative embodiment, shown in fig. 5, the present application employs continuous stitching projection. Specifically, the single-layer projection graph is output as a graph with ultrahigh resolution of A x B and is paved on the whole printing area, and the maximum graph resolution of one-time projection of the DLP optical projection machine is fixed to a x B, so that the DLP optical projection machine updates the projection picture once every 1 pixel is moved in the moving process, and the A x B small graphs with a x B resolution are continuously moved and spliced into the graph of A x B in the printing area. Assuming that the entire print region size of the print platform is 6 × 4mm, the print region output image resolution is 6 × 4, the DLP projection optics projection region size is 3 × 2mm, and the maximum projection resolution is 3 × 2, the distance per pixel is calculated to be 1 mm. The plane moving assembly 2 drives the DLP projection machine 1, a new projection graph is updated once when the DLP projection machine moves 1mm at a certain speed in the positive direction of an X axis, until the continuous motion projection in the direction of the X axis is finished, then the DLP projection machine moves the length distance of a projection area of the DLP projection machine at a certain speed in the positive direction of a Y axis, the new projection graph is updated once when the DLP projection machine 1 moves 1mm at a certain speed in the negative direction of the X axis, and the continuous motion splicing projection in the printing area is performed according to the rule. Wherein the updated projected pattern is a 3X 2 pattern dividing the entire printed area pattern 6X 4 by X-axis pixels and length.
In an alternative embodiment, as shown in fig. 6, the present application employs intermittent stitching projections. Specifically, the single-layer projection graph is output as a graph with ultrahigh resolution A × B and is paved on the whole printing area, and the maximum graph resolution of one-time projection of the DLP projection optical machine is fixed to a × B, so that the DLP projection optical machine updates the projection picture once every time a pixel is moved, and small graph gap motions of A × B and a × B resolutions are spliced into the graph of A × B in the printing area. Assuming that the size of the whole printing area is 6 × 4mm, the resolution of the output image of the printing area is 6 × 4, the size of the projection area of the DLP projection optical machine is 3 × 2mm, and the maximum projection resolution is 3 × 2, the distance of each pixel is 1mm according to calculation. The XY motion structure 2 of the DLP projection light machine drives the DLP projection light machine 1, and a pattern is projected once every time the positive direction of an X axis moves by a projection width, namely 2mm, at a certain speed, and then stays for an exposure time. And then moving a projection width and projecting a primary graph, then staying for an exposure time until the projection content in the X-axis direction is finished, then moving a projection length, namely 3mm, in the positive direction of the Y-axis at a certain speed, projecting the primary graph, then staying for an exposure time, then moving a projection width and projecting the primary graph again, and then staying for an exposure time until the projection content in the X-axis direction is finished. And splicing the projections in the printing area by gap movement according to the rule. Wherein the updated projected pattern is a 3 x 2 pattern dividing the entire printed area pattern 6 x 4 according to the projected length and width.
The application also protects a photocuring 3D printer, and the printer adopts the large-size photocuring 3D printing method. After the projection of the DLP optical projection engine in this embodiment is completed at one position, the DLP optical projection engine is moved in the X-axis and Y-axis directions of the plane, and then the DLP optical projection engine is projected at another position until the projection of the single-layer complete pattern of the model is completed, and then the single-layer curing is performed. By the method, a model with a larger size can be printed, and compared with laser and other forming printing modes, the DLP projection light machine printing method has the advantages of high printing speed and low printing difficulty
It should be noted that, after the photocuring 3D printer of the present application is started, the plane moving assembly and the scraper moving assembly of the photocuring 3D printer first execute the zeroing command, and then start printing. During printing, the X axis and the Y axis move continuously or intermittently, and the DLP projector projects the whole layer of pattern during the movement or intermittent movement and then cures the liquid photosensitive resin. After finishing printing the current layer, the Z axle descends one layer thickness, and the scraper is strickleed off the liquid level, continues the next layer again and prints until accomplishing all layers and printing, and the plane removes subassembly and scraper motion subassembly at last, prints the end. And taking down the resin model printed on the porous printing, and cleaning and post-curing the resin model to obtain the final printing model.
In an optional embodiment, the DLP projector uses a digital micromirror wafer as a main processing element to implement a digital optical processing process, which first digitally processes an image signal and then projects light; wherein the projected white area is a cured area and the black area is an uncured area.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A large-size photocuring 3D printing method is used for a photocuring 3D printer, and the photocuring 3D printer comprises the following steps: the device comprises a DLP (digital light processing) projection optical machine, a plane moving assembly, a scraper moving assembly, a printing platform lifting mechanism and a photosensitive resin material cylinder, wherein the DLP projection optical machine is arranged on the plane moving assembly; the large-size photocuring 3D printing method comprises the following steps:
importing a model file;
converting the model file into a print file;
pouring liquid photosensitive resin into the photosensitive resin material cylinder;
importing the printing file into the photocuring 3D printer;
the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, and splicing and projecting a layer of plane of the 3D model to form projection of a single-layer whole plane of the 3D model; curing the photosensitive resin material cylinder of the current layer;
the printing platform lifting mechanism descends to set thickness, and a scraper in the scraper moving mechanism scrapes off the liquid photosensitive resin material;
the plane moving assembly drives the DLP projection optical machine to move on a horizontal plane, the current-layer plane of the 3D model is spliced and projected to form the projection of the single-layer whole plane of the 3D model, the current-layer photosensitive resin material cylinder is cured, and the like until the 3D model is printed.
2. The large-size photocuring 3D printing method of claim 1, wherein the stitching projection is a continuous stitching projection or an intermittent stitching projection.
3. The large-sized photocuring 3D printing method according to claim 1, wherein the model file has a schema including any one of an STL format, an OBJ format, and an SLC format.
4. The large-size photocuring 3D printing method according to claim 3, wherein the DLP projector adopts a digital micromirror wafer as a main key processing element to realize a digital optical processing process, and image signals are digitally processed and then light is projected; wherein the projected white area is a cured area and the black area is an uncured area.
5. The large-size photocuring 3D printing method according to claim 2, wherein the continuous stitching projection is carried out by the following specific method:
the single-layer projection graph is output as a graph with ultrahigh resolution A x B and is paved on the whole printing area, and the maximum graph resolution of one-time projection of the DLP projection optical machine is fixed as a x B, so that the DLP projection optical machine updates the projection picture once every 1 pixel is moved in the moving process, and the A x B small graphs with the a x B resolution are continuously moved and spliced into the graph of A x B in the printing area.
6. The large-size photocuring 3D printing method of claim 2, wherein the method of intermittent stitching projection is: the single-layer projection graph is output as a graph with ultrahigh resolution A x B and is paved on the whole printing area, and the maximum graph resolution of one-time projection of the DLP projection optical machine is fixed as a x B, so that the DLP projection optical machine updates the projection picture once every a pixels are moved, and the A x B small graph gap motions with a x B resolution are spliced into the graph of A x B in the printing area.
7. A photocuring 3D printer characterized by employing the large-size photocuring 3D printing method as set forth in any one of claims 1 to 6.
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| EP4173804A1 (en) * | 2021-11-02 | 2023-05-03 | Aidite (Qinhuangdao) Technology Co., Ltd. | 3d printer and 3d printing method |
| US11951680B2 (en) * | 2021-11-02 | 2024-04-09 | Aidite (Qinhuangdao) Technology Co., Ltd. | Sunken 3D printer and 3D printing method |
| CN114311219A (en) * | 2021-12-27 | 2022-04-12 | 杭州电子科技大学 | Photocuring forming device capable of being used for printing high-viscosity multi-material structure |
| CN115008739A (en) * | 2022-06-24 | 2022-09-06 | 东莞爱的合成材料科技有限公司 | Three-dimensional object continuous printing method and equipment, electronic equipment and storage medium |
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Application publication date: 20201023 |