CN103847240B - Three-dimensional digital printer and stereoscopic picture printing method thereof - Google Patents
Three-dimensional digital printer and stereoscopic picture printing method thereof Download PDFInfo
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- CN103847240B CN103847240B CN201210504393.0A CN201210504393A CN103847240B CN 103847240 B CN103847240 B CN 103847240B CN 201210504393 A CN201210504393 A CN 201210504393A CN 103847240 B CN103847240 B CN 103847240B
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- ink
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
-
- 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
Abstract
The present invention relates to three-dimensional digital printer and stereoscopic picture printing method thereof, this three-dimensional digital printer includes computer control system, graph scanning system and digital printing system, described graph scanning system and digital printing system all electrically connect with described computer control system, described graph scanning system is for scan manuscript body and the original image information of acquisition is exported described computer control system, and stock is carried out ink-jet solidification by described digital printing system under the control of described computer control system. The present invention has high-fidelity also original image, stable performance, application scalability advantages of higher.
Description
Technical field
The present invention relates to a kind of printing equipment, particularly to a kind of three-dimensional digital printer and stereoscopic picture printing method thereof.
Background technology
At present, along with the living standard of people steps up, the digital printed life progressively walking close to people. In present industry, digital printing apparatus has two kinds: ink jet type digital printer and numeral imaging type digital printer. Utilizing both printer can produce the product with general effect, and speed of production is fast, cost is low. But produce the product with 3-D effect, then need product carries out overlapping ink-jet, constantly pile up ink on its surface to form 3D effect. The 3-D effect of this kind of method formation is poor, and production cost is high. Cannot complete for more complicated space pattern print reproduction.
At number of patent application: 03800838.6 description proposes a kind of method using ink-jet printer to make three dimensional printing image: it uses ink-jet printer at painting canvas surface printing image, jog needed for dimensional printed chart picture adheres to white primer agent material and forms the depression corresponding to dimensional printed chart picture and protruding surface, after obtaining needing the concavo-convex bottom of duplicating image completely, recycling ink-jet printer, at the identical image of ink jet printing, therefore obtains the three dimensional printing image with the state identical with the concavo-convex state of original oil painting. But, the pattern that the ink particle of the shower nozzle injection of ink-jet printer is formed is flat and smooth, when depression and protruding image phase are put adjacent, owing to the discrepancy in elevation exists, the local location that there is drop cannot be carried out ink-jet by shower nozzle, or the image of ink-jet can deform, and causes image fault. Meanwhile, the edge of depression and protruding position, boundary and pattern cannot be processed by shower nozzle. Problem above, all makes that 3D is digital printed to be restricted at product and technology field, it is impossible to be used widely.
Summary of the invention
The technical problems such as the purpose of the present invention is contemplated to solve image fault that prior art three dimensional printer exists, application scalability is low, the present invention provides a kind of three-dimensional digital printer.
The concrete technical scheme of the present invention is as follows:
The present invention provides a kind of three-dimensional digital printer, it includes computer control system, graph scanning system and digital printing system, described graph scanning system and digital printing system all electrically connect with described computer control system, described graph scanning system is for scan manuscript body and the original image information of acquisition is exported described computer control system, and stock is carried out ink-jet solidification by described digital printing system under the control of described computer control system.
Further, described digital printing system includes the first ink gun, a UV-LED lamp group and detection head, stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, a described UV-LED lamp group is for solidifying the ink on described stock surface, and described detection head is for detecting the image information on described stock surface and being output to described computer control system.
Further, described digital printing system also includes the second ink gun and the 2nd UV-LED lamp group, stock is carried out color jet-ink by described second ink gun under the control of described computer control system, and described 2nd UV-LED lamp group is for solidifying the colored ink on described stock surface.
Further, described digital printing system also includes the first work platforms and the first driving device, described first work platforms is used for carrying and fixing described stock, and described first driving device is used for driving described first ink gun, detecting head and the second ink gun along the first movable workbench.
Further, described computer control system includes control equipment, display device and input equipment, described control equipment is for receiving graph scanning system and the signal of digital printing system offer, and outputs a control signal to graph scanning system and digital printing system; The relevant information that described display device processes for display control apparatus; Described input equipment for being converted to the signal of telecommunication and being supplied to control equipment by external signal.
Further, described graph scanning system includes probe, the second workbench and the second driving device, described probe is for scan manuscript body and the original image information of acquisition is exported described computer control system, described second workbench is used for carrying and fixing original copy body, and described second driving device is used for driving described probe along the second movable workbench.
Further, described probe includes multiple imageing sensor and multiple illuminating lamp, and described imageing sensor obtains the image information of described original copy body under the cooperation of described illuminating lamp.
Further, described original image information includes three-dimensional information and color information.
The present invention also provides for a kind of stereoscopic picture printing method of three-dimensional digital printer described in technical scheme as described above, and it comprises the steps:
Step S1, the first workbench of described digital printing system carries and fixes stock;
Step S2, after stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, a described UV-LED lamp group solidifies the ink on described stock surface;
Step S3, described detection head detects the image information on described stock surface and is output to described computer control system, the image information on the stock surface received and predetermined image information are compared by described computer control system, if it is consistent, then carry out step S4, if it is inconsistent, return step S3;
Step S4, after stock is carried out color jet-ink by described second ink gun under the control of described computer control system, described 2nd UV-LED lamp group solidifies the ink on described stock surface.
Further, before step S1, following steps are farther included:
Step S0, the original image information of acquisition is also exported described computer control system by graph scanning system scan manuscript body.
Compared to prior art, mainly having the beneficial effects that of three-dimensional digital printer of the present invention and stereoscopic picture printing method thereof: three-dimensional digital printer of the present invention adopts the first ink gun and the second ink gun successively to carry out the ink-jet of three-dimensional height and color jet-ink, solidify respectively, it is possible to the effect of the different original copy of reduction completely.In addition, after the first ink gun carries out the ink-jet of three-dimensional height, detection head is utilized to carry out detecting to determine whether that starting the second ink gun carries out color jet-ink, it is truly realized the effect obtaining high fidelity visual, the details making each image can reduce original copy really, the problem that there is localized distortion when solving image printing. It addition, three-dimensional digital printer can need to arrange the resolution of the number of times of ink-jet and ink jet image according to practical operation, there is stable performance, application scalability advantages of higher.
Accompanying drawing explanation
Fig. 1 is the block diagram of the embodiment of the present invention 1 three-dimensional digital printer;
Fig. 2 is the block diagram of the digital printing system of the embodiment of the present invention 1 three-dimensional digital printer;
Fig. 3 is the block diagram of the computer control system of the embodiment of the present invention 1 three-dimensional digital printer;
Fig. 4 is the block diagram of the graph scanning system of the embodiment of the present invention 1 three-dimensional digital printer;
Fig. 5 is the schematic flow sheet of the stereoscopic picture printing method of the embodiment of the present invention 2 three-dimensional digital printer.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, be not used to limit the present invention.
Embodiment 1
As it is shown in figure 1, a kind of three-dimensional digital printer provided by the invention, it includes computer control system, graph scanning system and digital printing system. Described graph scanning system and digital printing system all electrically connect with described computer control system. Described graph scanning system is for scan manuscript body and the original image information of acquisition is exported described computer control system, and stock is carried out ink-jet solidification by described digital printing system under the control of described computer control system. Described original image information includes three-dimensional information and color information.
As in figure 2 it is shown, described digital printing system includes the first ink gun, a UV-LED lamp group, detection head, the second ink gun, the 2nd UV-LED lamp group, the first work platforms and the first driving device. Described first driving device is used for driving described first ink gun, detecting head and the second ink gun along the first movable workbench. Described first work platforms is used for carrying and fixing described stock, and described first work platforms has air suction function, in order to fixing stock.
Stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, forms the three-dimensional bottom consistent with described computer control system predetermined file information on the substrate. If it is inconsistent, stock is carried out three-dimensional height ink-jet work by ink gun 1 again repeatedly. Described first ink gun is formed by organizing nozzle more, and many group nozzles are by hose connection print cartridge, and many group nozzle spray printings are same color inks. Ink-jet can be white or colourless resin ink. Resin ink is generally made up of polymer, surfactant, defoamer, smooth agent etc.
A described UV-LED lamp group is for solidifying the ink on described stock surface. A described UV-LED lamp group is fixing with described first ink gun to be connected, and a described UV-LED lamp group is cold light lamp group.
Described detection head is for detecting the image information on described stock surface and being output to described computer control system. Described detection head is after a described UV-LED lamp group completes the solidification of stock surface ink, and the three-dimensional bottom layer height of described stock surface ink is scanned detection by it, and the image information detected exports described computer control system.Described detection head is additionally operable to position the ink jetting position of a described UV-LED lamp group, namely under the control of described computer control system, before described first ink gun starts ink-jet, described detection head is previously-scanned to the stock being placed on described first workbench, after described detection head determines ink jetting position, described first ink gun starts stock ink jet printing again. Described detection head also has multiple detection light source, and described detection light source illuminates to coordinate the work of described detection head detection stock for providing.
Stock is carried out color jet-ink by described second ink gun under the control of described computer control system, forms the coloured image consistent with described computer control system predetermined file information on the substrate. The image information on the stock surface that described computer control system provides according to described detection head, it may be judged whether start described second ink gun work. Described second ink gun is made up of the nozzle organizing color more, and the nozzle of each color is connected with print cartridge by flexible pipe. The colour cell of described nozzle is generally arranged at 8 colors, it may be assumed that red, yellow, blue, purple, bright red, black, white, orange, but is not limited to 8 colors simultaneously, or other more colors.
Described 2nd UV-LED lamp group is for solidifying the colored ink on described stock surface. Described 2nd UV-LED lamp group is fixing with described second ink gun to be connected, and described 2nd UV-LED lamp group is cold light lamp group.
All electrically connect with described control equipment as it is shown on figure 3, described computer control system includes control equipment, display device and input equipment, described display device and described input equipment. Described control equipment is for receiving graph scanning system and the signal of digital printing system offer, and outputs a control signal to graph scanning system and digital printing system. Wherein, described control equipment receives the original image information of the original copy body that described graph scanning system provides, and predetermined file information is changed and be stored as to three-dimensional information and the color information of described original copy body by it. Described control equipment receives the three-dimensional bottom layer height information of the stock surface ink of the detection head offer of described digital printing system, itself and predetermined file information is compared; If consistent, then described control equipment starts described second ink gun and stock is carried out color jet-ink; If it is inconsistent, described control equipment starts ink gun 1, and stock carries out three-dimensional height ink-jet again repeatedly. The relevant information that described display device processes for display control apparatus; Described input equipment for being converted to the signal of telecommunication and being supplied to control equipment by external signal.
As shown in Figure 4, described graph scanning system includes probe, the second workbench and the second driving device, and described second workbench is used for carrying and fixing original copy body, and described second driving device is used for driving described probe along the second movable workbench. Described probe is for scan manuscript body and the original image information of acquisition is exported described computer control system. Described probe includes multiple imageing sensor and multiple scanning light source, and described imageing sensor obtains the image information of described original copy body under the cooperation of described scanning light source. The number of times that described original copy body is scanned is generally three times or more than three times by described probe, and first time is location preliminary scan, and second time is fine scanning, and third time scans for local fine. Alternatively, it is also possible to the feature according to original copy body, and the needs of practical operation, the concrete resolution setting scanning times and needing output image information.
Embodiment 2
Three-dimensional digital printer in three-dimensional digital printer of the present invention and embodiment 1 is essentially identical, as it is shown in figure 5, a kind of stereoscopic picture printing method of three-dimensional digital printer that the present invention also provides for, it comprises the steps.
Step S0, the original image information of acquisition is also exported described computer control system by described graph scanning system scan manuscript body.
Described control equipment receives the original image information of the original copy body that described graph scanning system provides, and predetermined file information is changed and be stored as to three-dimensional information and the color information of described original copy body by it.
The original image information of acquisition is also exported described computer control system by described probe scan manuscript body. Described probe includes multiple imageing sensor and multiple scanning light source, and described imageing sensor obtains the image information of described original copy body under the cooperation of described scanning light source. The number of times that described original copy body is scanned is generally three times or more than three times by described probe, and first time is location preliminary scan, and second time is fine scanning, and third time scans for local fine. Alternatively, it is also possible to the feature according to original copy body, and the needs of practical operation, the concrete resolution setting scanning times and needing output image information. Second workbench of described graph scanning system carries and fixes original copy body, and described second driving device drives described probe along the second movable workbench. If the stored image information having original copy body in described computer control system, then step S0 can omit.
Step S1, the first workbench of described digital printing system carries and fixes stock.
Described first work platforms has air suction function, in order to fixing stock.
Step S2, after stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, a described UV-LED lamp group solidifies the ink on described stock surface.
Under the control of described computer control system, before described first ink gun starts ink-jet, described detection head is previously-scanned to the stock being placed on described first workbench, and after described detection head determines ink jetting position, described first ink gun starts stock ink jet printing again. Described detection head also has multiple detection light source, and described detection light source illuminates to coordinate the work of described detection head detection stock for providing.
Stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, forms the three-dimensional bottom consistent with described computer control system predetermined file information on the substrate. Described first ink gun is formed by organizing nozzle more, and many group nozzles are by hose connection print cartridge, and many group nozzle spray printings are same color inks. Ink-jet can be white or colourless resin ink. Resin ink is generally made up of polymer, surfactant, defoamer, smooth agent etc.
After the ink-jet of described first ink gun has worked, a described UV-LED lamp group solidifies the three-dimensional height ink on described stock surface. A described UV-LED lamp group is fixing with described first ink gun to be connected, and a described UV-LED lamp group is cold light lamp group. Described first driving device drives described first ink gun, detects head and the second ink gun along the first movable workbench.
Step S3, described detection head detects the image information on described stock surface and is output to described computer control system, the image information on the stock surface received and predetermined image information are compared by described computer control system, if it is consistent, then carry out step S4, if it is inconsistent, return step S3.
Described detection head is after a described UV-LED lamp group completes the solidification of stock surface ink, and the three-dimensional bottom layer height of described stock surface ink is scanned detection by it, and the image information detected exports described computer control system.The control equipment of described computer control system receives the three-dimensional bottom layer height information of the stock surface ink of the detection head offer of described digital printing system, itself and predetermined file information is compared; If consistent, then carrying out step S4, described control equipment starts described second ink gun and stock is carried out color jet-ink; If it is inconsistent, return step S2, described control equipment starts ink gun 1 and stock carries out three-dimensional height ink-jet again repeatedly.
Step S4, after stock is carried out color jet-ink by described second ink gun under the control of described computer control system, described 2nd UV-LED lamp group solidifies the ink on described stock surface.
Stock is carried out color jet-ink by described second ink gun under the control of described computer control system, forms the coloured image consistent with described computer control system predetermined file information on the substrate. Described second ink gun is made up of the nozzle organizing color more, and the nozzle of each color is connected with print cartridge by flexible pipe. The colour cell of described nozzle is generally arranged at 8 colors, it may be assumed that red, yellow, blue, purple, bright red, black, white, orange, but is not limited to 8 colors simultaneously, or other more colors.
After the ink-jet of described second ink gun has worked, described 2nd UV-LED lamp group solidifies the colored ink on described stock surface. Described 2nd UV-LED lamp group is fixing with described second ink gun to be connected, and described 2nd UV-LED lamp group is cold light lamp group.
So far, three-dimensional digital printer of the present invention completes the printing of the three-dimensional height to described stock surface and coloured image.
It should be noted that, above example is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail with reference to preferred embodiment, it will be understood by those within the art that, technical scheme can be modified or equivalent replacement, without deviating from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (8)
1. a three-dimensional digital printer, it is characterized in that, including: computer control system, graph scanning system and digital printing system, described graph scanning system and digital printing system all electrically connect with described computer control system, described graph scanning system is for scan manuscript body and the original image information of acquisition is exported described computer control system, and stock is carried out ink-jet solidification by described digital printing system under the control of described computer control system; Described digital printing system includes the first ink gun, a UV-LED lamp group and detection head, stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, a described UV-LED lamp group is for solidifying the ink on described stock surface, and described detection head is for detecting the image information on described stock surface and being output to described computer control system; Described digital printing system also includes the second ink gun and the 2nd UV-LED lamp group, stock is carried out color jet-ink by described second ink gun under the control of described computer control system, and described 2nd UV-LED lamp group is for solidifying the colored ink on described stock surface.
2. three-dimensional digital printer according to claim 1, it is characterized in that, described digital printing system also includes the first work platforms and the first driving device, described first work platforms is used for carrying and fixing described stock, and described first driving device is used for driving described first ink gun, detecting head and the second ink gun along the first movable workbench.
3. three-dimensional digital printer according to claim 1, it is characterized in that, described computer control system includes control equipment, display device and input equipment, described control equipment is for receiving graph scanning system and the signal of digital printing system offer, and outputs a control signal to graph scanning system and digital printing system;The relevant information that described display device processes for display control apparatus; Described input equipment for being converted to the signal of telecommunication and being supplied to control equipment by external signal.
4. three-dimensional digital printer according to claim 1, it is characterized in that, described graph scanning system includes probe, the second workbench and the second driving device, described probe is for scan manuscript body and the original image information of acquisition is exported described computer control system, described second workbench is used for carrying and fixing original copy body, and described second driving device is used for driving described probe along the second movable workbench.
5. three-dimensional digital printer according to claim 4, it is characterised in that described probe includes multiple imageing sensor and multiple illuminating lamp, described imageing sensor obtains the image information of described original copy body under the cooperation of described illuminating lamp.
6. three-dimensional digital printer according to claim 1, it is characterised in that described original image information includes three-dimensional information and color information.
7. the stereoscopic picture printing method of a three-dimensional digital printer as claimed in claim 1, it is characterised in that comprise the steps:
Step S1, the first workbench of described digital printing system carries and fixes stock;
Step S2, after stock is carried out the ink-jet of three-dimensional height by described first ink gun under the control of described computer control system, a described UV-LED lamp group solidifies the ink on described stock surface;
Step S3, described detection head detects the image information on described stock surface and is output to described computer control system, the image information on the stock surface received and predetermined image information are compared by described computer control system, if it is consistent, then carry out step S4, if it is inconsistent, return step S3;
Step S4, after stock is carried out color jet-ink by described second ink gun under the control of described computer control system, described 2nd UV-LED lamp group solidifies the ink on described stock surface.
8. the stereoscopic picture printing method of three-dimensional digital printer according to claim 7, it is characterised in that farther included following steps before step S1:
Step S0, the original image information of acquisition is also exported described computer control system by graph scanning system scan manuscript body.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210504393.0A CN103847240B (en) | 2012-11-30 | 2012-11-30 | Three-dimensional digital printer and stereoscopic picture printing method thereof |
| PCT/CN2013/070154 WO2014082382A1 (en) | 2012-11-30 | 2013-01-07 | Three-dimensional digital printer and stereo image printing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210504393.0A CN103847240B (en) | 2012-11-30 | 2012-11-30 | Three-dimensional digital printer and stereoscopic picture printing method thereof |
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| CN103847240A CN103847240A (en) | 2014-06-11 |
| CN103847240B true CN103847240B (en) | 2016-06-08 |
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| WO (1) | WO2014082382A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104249578B (en) * | 2014-09-24 | 2017-01-11 | 福建省中煌立体文化有限公司 | Raster plate seamless splicing type printing method for 3D (three dimensional) stereographs |
| CN105904867A (en) * | 2016-04-26 | 2016-08-31 | 东莞市上合旺盈印刷有限公司 | Multicolor digital printing technique |
| CN109228709A (en) * | 2018-09-30 | 2019-01-18 | 鸿兴印刷（中国）有限公司 | A kind of braille salient point book publishing method |
| JP6939764B2 (en) * | 2018-12-26 | 2021-09-22 | カシオ計算機株式会社 | Display device, modeling system, display method and program |
| CN112976825B (en) * | 2021-03-15 | 2023-01-13 | 上海普超防伪印刷科技有限公司 | Three-dimensional code compatible with two-dimensional code and realized based on printing and printing, and printing method, identification method and compiling method thereof |
| CN114379264B (en) * | 2021-12-07 | 2024-01-30 | 群滨智造科技(苏州)有限公司 | Intelligent ink-jet method for guiding mobile phone glass screen through 3D vision and related equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203126138U (en) * | 2012-11-30 | 2013-08-14 | 李华容 | Three-dimensional digital printing machine |
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| GB9611582D0 (en) * | 1996-06-04 | 1996-08-07 | Thin Film Technology Consultan | 3D printing and forming of structures |
| JPH1044582A (en) * | 1996-07-30 | 1998-02-17 | Sony Corp | Thermal transfer recording of three-dimensional image and medium used therein |
| JP2003226002A (en) * | 2002-02-04 | 2003-08-12 | Seiko Epson Corp | Printer, body to be printed, storage element, computer program, computer system and printing method |
| CN1308143C (en) * | 2002-03-26 | 2007-04-04 | 马斯特满股份有限公司 | Three-dimensional printed image creating method and three-dimensional printed articles |
| JP2004249617A (en) * | 2003-02-21 | 2004-09-09 | Hitachi Printing Solutions Ltd | Printing method |
| EP1462266B1 (en) * | 2003-02-26 | 2006-05-17 | Fuji Photo Film Co., Ltd. | Three-dimensional image forming method and apparatus |
| EP2199065B1 (en) * | 2008-12-19 | 2012-03-21 | Agfa Graphics N.V. | Image processing method for three-dimensional printing |
| DE102009044802B4 (en) * | 2009-11-30 | 2017-11-23 | Hymmen GmbH Maschinen- und Anlagenbau | Method and device for producing a three-dimensional surface structure on a workpiece |
| PL2632696T3 (en) * | 2010-10-27 | 2021-03-08 | Rize Inc. | Process and apparatus for fabrication of three-dimensional objects |
| CN102173246B (en) * | 2011-02-18 | 2013-01-02 | 中国印刷科学技术研究所 | Lenticular printing method for lenticule on demand through ink jet |
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| CN203126138U (en) * | 2012-11-30 | 2013-08-14 | 李华容 | Three-dimensional digital printing machine |
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