CN108357088B - One kind is exempted to support 3D printing method - Google Patents
One kind is exempted to support 3D printing method Download PDFInfo
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- CN108357088B CN108357088B CN201810147749.7A CN201810147749A CN108357088B CN 108357088 B CN108357088 B CN 108357088B CN 201810147749 A CN201810147749 A CN 201810147749A CN 108357088 B CN108357088 B CN 108357088B
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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
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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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Abstract
Exempt to support 3D printing method the present invention relates to one kind, this method includes at least following steps: light-sensitive material being unfolded to form the uniform film layer of thickness, expose and complete the first layer printing of 3D model according to slice pattern to film layer using light source, the initial layers that print using the unexposed part of film layer as the 3D model second layer are simultaneously printed according to the second layer that Method of printing identical with first layer completes 3D model, it is printed using the film layer initial layers that unexposed part is printed as 3D model third layer when printing the second layer and according to the third layer that Method of printing identical with the second layer completes 3D model, so circulation, until the printing of 3D model is completed.3D printing method of the invention uses the gel state of light-sensitive material itself as support, exempts the addition of support, considerably reduces printing difficulty, improve success rate；On the other hand, 3D printing method of the invention supports, so that printout is more beautiful due to not having addition to support without removing.
Description
Technical field
Exempt to support 3D printing method the present invention relates to 3D printing technique field more particularly to one kind.
Background technique
Traditional photosensitive 3D printing material is the liquid photosensitive substance with good flow degree, is switched to admittedly after illumination by liquid
State.Photosensitive 3D printer is used to be completed to print by 3D model in such a way that certain thickness step section successively exposes.Print procedure
In, photo-crosslinking is generated after traditional photosensitive 3D printing material exposure and solid-state is changed by liquid, this process is irreversible
, after completing one layer of printing, that is, continues next layer of printing, next layer and upper one layer bonding, finally realize entire model printing.It beats
During print, encounter the hanging point first appeared, need to fix the point using support, successively printing until this at and main part
Bonding.
The photosensitive 3D printer of mainstream includes SLA currently on the market, DLP, and the types such as ink jet type are distinguished again from printing type
For ascending manner and descending manner.In addition to ink jet type 3D printer, most 3D printer is required hanging point addition branch in advance
Support could complete printing.Ink-jet mode forms solid state support layer, printing after passing through the photosensitive polymer exposure that injection can be water-soluble
It finishes and clears up support section again, this supporting layer is disposable products, can not be recycled, and viscosity requirement is high, expensive.
On the other hand, remaining 3D printer is required before the printing of 3D model in advance by hanging point addition support, could be complete
At printing.Support needs algorithm to support or add automatically by experience.Due to the particularity of some models, support is difficult to add
Add, or be difficult to remove after addition, that is, the superiority and inferiority supported will seriously affect final printing effect.It supports and very few will lead to model
Excalation or deformation, support excessively not only waste material, and the dismounting that can also support for the later period brings inconvenience, therefore support
Addition has become the generally acknowledged technological difficulties of 3D printing industry, limits entire industry development.
Therefore it provides one kind exempts from that 3D printing method is supported to become those skilled in the art's technical problem urgently to be solved.
Summary of the invention
For above-mentioned technical problem of the existing technology, exempt to support 3D printing method the present invention provides one kind.It is described
Exempt from support 3D printing method be by using light-sensitive material under different shearing forces, illumination, temperature, electric field and/or magnetic field not
The different shape that shows with rheological property is realized.
According to a preferred embodiment, the method includes at least following steps:
Light-sensitive material is unfolded to form the uniform film layer of thickness,
Expose and complete the first layer printing of 3D model according to slice pattern to the film layer using light source,
The initial layers that are printed using the unexposed part of the film layer as the 3D model second layer and according to
One layer of identical Method of printing completes the second layer printing of the 3D model,
Using the film layer that unexposed part is printed as the 3D model third layer when printing the second layer
Beginning layer is simultaneously printed according to the third layer that Method of printing identical with the second layer completes the 3D model, is so recycled, until 3D mould
Type printing is completed.
According to a preferred embodiment, initial phase is printed, the light-sensitive material is by shearing force, no light, height
Temperature, without electric field and without the effect at least one of magnetic field when form flowable state, make it possible to be unfolded to be formed by the light-sensitive material
The uniform film layer of thickness.
According to a preferred embodiment, in each layer of print procedure of the 3D model, the film layer exposure
Part becomes solid-state from flowable state.
According to a preferred embodiment, in each layer of print procedure of the 3D model, the film layer is unexposed
Part keep flowable state.
According to a preferred embodiment, after the completion of each layer of printing of the 3D model, the film layer is unexposed
The subsequent shearing force that is subject in part reduce, reduced, by illumination, the temperature being subject to by electric field and by magnetic field at least one
The effect of kind, so that the unexposed part of the film layer is gradually converted into gel state by flowable state.
According to a preferred embodiment, the film layer for being changed into gel state is beaten as lower layer of the 3D model
The initial layers of print and the next layer of printing that the 3D model is completed according to Method of printing identical with preceding layer, so recycle, directly
It is completed to printing.
According to a preferred embodiment, the 3D model for printing completion is wrapped in the material for being changed into gel state
In film layer.
According to a preferred embodiment, the method also includes following steps: after the completion of 3D model printing, to
The film layer for being changed into gel state applies shearing force, cancels illumination, increases temperature, cancels electric field and/or cancel magnetic field
Effect and so that the film layer is reverted to flowable state by gel state, will print complete the 3D model take out.
According to a preferred embodiment, 3D can be recycled and reused for by the film layer that gel state reverts to flowable state
The printing of model.
According to a preferred embodiment, the light-sensitive material is one of pseudoplastic behavior light-sensitive material or a variety of.
It is provided by the invention to exempt from that 3D printing method is supported at least to have the advantage that
(1) it is of the invention exempt to support 3D printing method using light-sensitive material different shearing forces, illumination, temperature, electric field and/
Or the different shape that shows of the different rheological properties under magnetic field is realized, specifically, the light-sensitive material used is in feed with liquid
State exists, convenient uniformly to sprawl realization printing, after the completion of printing, change the shearing force applied to light-sensitive material, illumination, temperature,
The effect of at least one of electric and magnetic fields, unexposed light-sensitive material are changed into gel state immediately, and this gel state can be made
For backing material presence, 3D printing method of the invention uses the gel state of light-sensitive material itself as support, exempts support
Addition, considerably reduces printing difficulty, improves success rate；On the other hand, 3D printing method of the invention is not due to adding
Add support, therefore supported without removing, so that printout is more beautiful.
(2) it is preferable to use have to can change rheological property under given conditions for 3D printing method of exempting to support of the invention
For material as light-sensitive material, this kind of light-sensitive material is recyclable, solves waste of material caused by existing ink jet type 3D printing
Problem has advantage cheap, without specific viscosity requirement, is a kind of novel 3D printing side of great marketing potentiality
Formula.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram for exempting to support a preferred embodiment of 3D printing method of the invention.
1- scraper plate in figure；2- laser；3-3D model；4- flowable state light-sensitive material；5- gel state light-sensitive material.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
For defect existing for existing 3D printing technique, exempt to support 3D printing method the present invention provides one kind.It is described to exempt from
Support 3D printing method is by the difference using light-sensitive material under different shearing forces, illumination, temperature, electric field and/or magnetic field
Different shape that rheological property is shown is realized.Preferably, the light-sensitive material that the present invention selects different shearing forces, illumination,
Flowable state, solid-state or similar semisolid gel state are at least capable of forming under temperature, electric field and/or magnetic field.It is furthermore preferred that this hair
The light-sensitive material of bright selection can be individually forms flowable state, solid-state under different shearing forces, illumination, temperature, electric field or magnetic field
Or similar semisolid gel state.The light-sensitive material that the present invention selects is also possible in different shearing forces, illumination, temperature, electric field
With flowable state, solid-state or similar semisolid gel state are formed under the action of at least one of magnetic field.
Light-sensitive material of the invention is flowable state in the initial state, convenient uniformly to sprawl realization printing；After the completion of printing,
Since light-sensitive material has the characteristics that can change rheological property under given conditions, change the shearing applied to light-sensitive material
Power, illumination, temperature, electric field and/or magnetic field change the rheological property of unexposed light-sensitive material, even if light-sensitive material is by flowing
Dynamic transition is gel state.This gel state can be used as backing material presence, and 3D printing method of the invention uses photosensitive material
Expect that the gel state of itself as support, exempts the addition of support, considerably reduces printing difficulty, improve success rate；It is another
Aspect, 3D printing method of the invention support, so that printout is more beautiful due to not having addition to support without removing
It sees.
According to a preferred embodiment, the thixotropy for exempting from that 3D printing method is supported mainly to utilize light-sensitive material of the invention
Feature realizes the 3D printing for exempting from support, is specifically that light-sensitive material is utilized to have class under low-shearing force or without shearing force state
The 3D printing method for exempting from support is realized like semisolid gel state.Support 3D printing method of exempting from of the invention is exempted to prop up with existing
Support 3D printing scheme is compared, and light-sensitive material itself gel state is used to have reusable photosensitive material as the scheme of support
Material is not necessarily to support, is cheap, without advantages such as specific viscosity requirements.
It is of the present invention using shearing force control rheological property difference to realize that unsupported method can derive to cutting
Other modes of action except shear force, such as illumination, temperature, electric field and/or magnetic field.By taking temperature as an example, light-sensitive material is in difference
At a temperature of show that different rheological properties, the thinning low temperature of high temperature are hardened, high temperature is similar to high shear force to the effect of light-sensitive material
Effect to light-sensitive material, low temperature are similar to effect of the low-shearing force to light-sensitive material to the effect of light-sensitive material.Which
It may be implemented to a certain extent using the rheological property variation of light-sensitive material to realize without support.Illumination, electric field and/or magnetic field
It is opposite to the mode of action of light-sensitive material to the mode of action and shearing force and temperature of light-sensitive material.I.e. light-sensitive material is unglazed
According to, without electric field and without under the action of magnetic field be flowable state, under the action of having illumination, having electric field and have magnetic field for solidification state.
Specifically, shearing force is to utilize auxiliary agent thixotroping principle to the effect of light-sensitive material.Light-sensitive material is by high shear
When power, the space weak chemical bond net of light-sensitive material is realized by thixotropic agents, such as fumed silica, rilanit special auxiliary agent
Network structure, no shearing force or compared with low-shearing force when, will become the solidification state of g., jelly-like, and increase shearing force will become low viscosity again
Flowable state.Shearing force has invertibity to the effect of light-sensitive material.
According to a preferred embodiment, the present invention realizes the strong thixotropic characteristics of light-sensitive material using a kind of thixotropic agents.
Similar thixotropic characteristics may be implemented in commercially available number of types of thixotropic agents or resin monomer.Such as it is fumed silica, organic
Bentonite, rilanit special and polyamide etc. contain the monomer or resin for being not limited in the above substance above.Such
Substance not only has good thixotropy, but also has very high cost performance.The present invention is directed to protect light-sensitive material from figure
The photosensitive 3D printing scheme of similar supporting role is played at gel state/class solid-state material.
Specifically, illumination is to the weakly crosslinking mechanism that the effect of light-sensitive material is using light.It is i.e. low using light-sensitive material itself
Functional group reduces reaction density, and resin is made to be cross-linked to form the solidifying solid-state structure for being easy to destroy by the way that radical reaction is weak.It is preferred that
, the present invention is ultraviolet lighting to the illumination that light-sensitive material applies.Preferably, resin of the invention is in photo-crosslinking type resin
It is one or more.Such as conjugate and thermoprene of the cruel class of polyvinyl alcohol cinnamic acid, cinnamic acid and epoxy resin.
Specifically, electric current is to make light-sensitive material in certain electric field action by applying electric field to the effect of light-sensitive material
Under, become the solidification state of high rheological variation by flowable state, light-sensitive material itself is restored to flowable state after electric field disappears.I.e. electric current is to light
The effect of quick material has invertibity.Preferably, light-sensitive material of the invention is one of electro rheological fluids or a variety of.The present invention
Electro rheological fluids generally by continuous phase, suspended particulate and additive composition.Continuous phase is usually silicone oil, mineral oil and acrylic acid list
The liquid such as body, these liquid should usually have the features such as higher boiling, low viscosity, resistance are big, dielectric constant is high.Suspended particulate is general
Using the starch of absorption water or silica dioxide granule etc., additive generally has water and surfactant etc..
Specifically, magnetic field is to make light-sensitive material in certain magnetic fields by applying magnetic field to the effect of light-sensitive material
Under, become the solidification state of high rheological variation by flowable state, light-sensitive material itself is restored to flowable state after magnetic field disappears.I.e. magnetic field is to light
The effect of quick material has invertibity.Preferably, light-sensitive material of the invention is one of magnetic rheological body or a variety of.The present invention
Magnetic rheological body be that the ferromagnetic particle of micro-meter scale is incorporated into high molecular polymer, solidify under magnetic field environment, thus
The intracorporal particle of base forms the semi-solid structure of high rheological variation.
Specifically, temperature is to have good mobile performance at high temperature using photosensitive resin to the effect of light-sensitive material,
There is very high viscosity under low temperature or room temperature, be similar to semisolid state.Preferably, high temperature of the present invention is 30
~60 DEG C, low temperature is -20~20 DEG C.It is furthermore preferred that high temperature and low temperature of the invention is also possible to be had according to specific resin
Difference.Resin of the invention for example can be one of epoxy resin, acrylic resin, polyester resin or a variety of.
Fig. 1 shows the schematic diagram for exempting to support a preferred embodiment of 3D printing method of the invention.Such as Fig. 1 institute
Show, 1 is scraper plate in figure, and 2 be laser；3 be 3D model；4 be flowable state light-sensitive material；5 be gel state light-sensitive material.Below with reference to
Fig. 1 of the invention exempts to support 3D printing method to specifically describe.
According to a preferred embodiment, support 3D printing method of exempting from of the invention includes at least following steps:
S1: light-sensitive material is unfolded to form the uniform film layer of thickness.
S2: exposing film layer according to slice pattern using light source and completes the first layer printing of 3D model.
S3: the initial layers that are printed using the unexposed part of film layer as the 3D model second layer and according to first layer phase
Same Method of printing completes the second layer printing of 3D model.
S4: simultaneously using the film layer initial layers that unexposed part is printed as 3D model third layer when printing the second layer
The third layer printing that 3D model is completed according to Method of printing identical with the second layer, so recycles, until the printing of 3D model is completed.
Of the invention exempts to support 3D printing method to carry out 3D printing, In by using with extremely strong pseudoplastic light-sensitive material
Light-sensitive material exists when feed with liquid, convenient uniformly to sprawl realization printing, after the completion of printing, since light-sensitive material is with extremely strong
Pseudoplastic behavior, unexposed light-sensitive material is not affected by shearing force or the shearing force that is subject to reduces, is dropped by illumination, the temperature being subject to
It is low, by electric field and/or by the effect at least one of magnetic field when, the unexposed part of film layer immediately by flowable state by
Gradually it is changed into gel state.This gel state can be used as backing material presence, and 3D printing method of the invention uses light-sensitive material
The gel state of itself exempts the addition of support, considerably reduces printing difficulty, improve success rate as support；Another party
Face, 3D printing method of the invention support, so that printout is more beautiful due to not having addition to support without removing.
According to a preferred embodiment, print initial phase, light-sensitive material by shearing force, no light, high temperature, without electricity
And when effect without at least one of magnetic field form flowable state, make it possible to that light-sensitive material is unfolded to be formed the uniform material of thickness
Expect film layer, as shown in Figure 1.It is of the invention to exempt to support 3D printing method, in print procedure using high shear force, no light, high temperature,
No electric field and/or have the characteristics that good fluidity without light-sensitive material under magnetic field state, light-sensitive material is uniformly sprawled, is formed thick
Spend uniform film layer.
According to a preferred embodiment, in each layer of print procedure of 3D model, the part of film layer exposure is by flowing
Dynamic becomes gel state or solid-state.The film layer is exposed according to slice pattern using light source, exposed portion (drafting department
Point) light-sensitive material by liquid becomes solid-state, to form each layer structure of 3D printing model.
According to a preferred embodiment, in each layer of print procedure of 3D model, the unexposed part of film layer is protected
Hold flowable state.The light-sensitive material that the present invention uses, unexposed part, still maintains flowable state.
According to a preferred embodiment, after the completion of each layer of printing of 3D model, behind the unexposed part of film layer
The continuous shearing force being subject to reduces or is not affected by shearing force, reduced, by illumination, the temperature being subject to by electric field and by magnetic field
At least one of effect when so that the unexposed part of film layer is gradually converted into gel state by flowable state.Due to without after
Continuous shearing force or the shearing force being subject to reduce, are reduced, by illumination, the temperature being subject to by electric field and/or by magnetic field
Effect, unexposed portion gradually can be changed into the gel state entirely without mobility, such as Fig. 1 by the flowable state with good fluidity
It is shown.
According to a preferred embodiment, it is changed into the starting that the film layer of gel state is printed as lower layer of 3D model
Layer and the next layer of printing that 3D model is completed according to Method of printing identical with preceding layer, so recycle, until printing is completed.It is solidifying
Gelled part has some strength under shearing force low/no, illumination, low temperature, electric field and/or magnetic field, will rise as next layer
Beginning layer, play the role of with support it is identical, until printing complete.
According to a preferred embodiment, the 3D model for printing completion is wrapped in the film layer for being changed into gel state,
As shown in Figure 1.Gel state be under given conditions resin change rheological property a kind of state, Resin Rheology can change this
One process is reversible, and the printing of 3D model finishes, and is given in the certain shearing force of the film layer of gel state, is cancelled illumination, liter
High-temperature cancels electric field and/or cancels the effect in magnetic field, and gel state reverts to the flowable state with good fluidity, 3D immediately
Model can be convenient taking-up.After liquid photosensitive material is collected, can still it be re-used in 3D model printing next time.
S5: after the completion of the printing of 3D model, apply certain shearing force to the film layer for being changed into gel state, cancel light
According to, increase temperature, cancel electric field and/or cancel magnetic field effect and so that film layer is reverted to flowable state by gel state, will
The 3D model that printing is completed takes out.
According to a preferred embodiment, 3D model can be recycled and reused for by the film layer that gel state reverts to flowable state
Printing.It is of the invention exempt from 3D printing method is supported to use there is the photosensitive material that can change rheological property under given conditions
Expect recyclable, solve the problems, such as waste of material caused by existing ink jet type 3D printing, have it is cheap, without specific viscous
Desired advantage is spent, is a kind of novel 3D printing method of great marketing potentiality.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (6)
1. one kind is exempted to support 3D printing method, which is characterized in that described to exempt to support 3D printing method to be by utilizing light-sensitive material
Different shape that different rheological properties under different shearing forces, illumination, temperature, electric field and/or magnetic field are shown realizes,
In:
Print initial phase, the light-sensitive material by shearing force, no light, high temperature, without electric field and without in magnetic field at least one
Flowable state is formed when the effect of kind, makes it possible to be unfolded the light-sensitive material to form the uniform film layer of thickness；
In each layer of print procedure of 3D model, the part of the film layer exposure becomes solid-state, the material from flowable state
The unexposed part of film layer keeps flowable state；
After the completion of each layer of printing of the 3D model, the subsequent shearing force being subject in the unexposed part of film layer subtracts
It is small, by illumination, the temperature being subject to reduce, by electric field and by the effect at least one of magnetic field so that the material membrane
The unexposed part of layer is gradually converted into gel state by flowable state.
2. according to claim 1 exempt to support 3D printing method, which is characterized in that the method includes at least following step
It is rapid:
Light-sensitive material is unfolded to form the uniform film layer of thickness,
Expose and complete the first layer printing of 3D model according to slice pattern to the film layer using light source,
The initial layers that are printed using the unexposed part of the film layer as the 3D model second layer and according to first layer
Identical Method of printing completes the second layer printing of the 3D model,
Using the film layer initial layers that unexposed part is printed as the 3D model third layer when printing the second layer
And printed according to the third layer that Method of printing identical with the second layer completes the 3D model, it so recycles, until 3D model is beaten
Print is completed.
3. according to claim 2 exempt to support 3D printing method, which is characterized in that be changed into the material membrane of gel state
Layer as lower layer of 3D model printing initial layers and according to Method of printing identical with the preceding layer completion 3D model
Next layer printing, so recycle, until printing complete.
4. according to claim 3 exempt to support 3D printing method, which is characterized in that print the 3D model package of completion
In the film layer for being changed into gel state.
5. according to claim 4 exempt to support 3D printing method, which is characterized in that the method also includes following steps:
After the completion of 3D model printing, applies shearing force to the film layer for being changed into gel state, cancels illumination, raising temperature
Degree cancels electric field and/or cancels the effect in magnetic field and the film layer is made to revert to flowable state by gel state, will print
At the 3D model take out.
6. according to claim 5 exempt to support 3D printing method, which is characterized in that revert to the institute of flowable state by gel state
State the printing that film layer can be recycled and reused for 3D model.
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| CN201810147749.7A CN108357088B (en) | 2018-02-12 | 2018-02-12 | One kind is exempted to support 3D printing method |
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| CN109366971A (en) * | 2018-09-20 | 2019-02-22 | 中南大学 | It is a kind of without support increasing material manufacturing method |
| CN110421841A (en) * | 2019-09-05 | 2019-11-08 | 上海梓域材料科技有限公司 | One kind is exempted to support photosensitive 3D printer |
| CN113021561B (en) * | 2021-03-26 | 2022-05-31 | 上海建工建材科技集团股份有限公司 | 3D printing concrete printing support device and printing support method |
| CN116353054A (en) * | 2021-05-31 | 2023-06-30 | 苏州铼赛智能科技有限公司 | 3D printing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5362427A (en) * | 1993-05-10 | 1994-11-08 | Mitchell Jr Porter H | Method and apparatus for manufacturing an article using a support structure for supporting an article during manufacture therefor |
| JP6843047B2 (en) * | 2014-12-05 | 2021-03-17 | ユニバーシティ オブ フロリダ リサーチ ファンデーション インコーポレーティッド | 3D printing using a phase change substance as a support |
| CN205238585U (en) * | 2015-12-16 | 2016-05-18 | 济宁学院 | 3D printer based on controllable fluid |
| CN105538720B (en) * | 2016-01-22 | 2017-12-05 | 吴嘉馨 | 3D printing backing material shaped device based on magnetic flow liquid |
| CN107267386B (en) * | 2017-07-17 | 2020-08-11 | 西安点云生物科技有限公司 | 3D printing method |
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