CN103802322B - New 3D printer based on FDM - Google Patents
New 3D printer based on FDM Download PDFInfo
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- CN103802322B CN103802322B CN201410081889.0A CN201410081889A CN103802322B CN 103802322 B CN103802322 B CN 103802322B CN 201410081889 A CN201410081889 A CN 201410081889A CN 103802322 B CN103802322 B CN 103802322B
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Abstract
本发明公开了一种基于FDM的新型3D打印机，包括机架、底座、X轴移动系统、Z轴移动系统、打印装置，打印装置与X轴移动系统连接，X轴移动系统与Z轴移动系统连接，Z轴移动系统与立柱导轨连接，底座设有电源、控制器，控制器与Z轴移动系统连接，Z轴移动系统包括第三数控电机、左侧丝杠及右侧丝杠、Z轴固定座、限位开关，左侧丝杠、右侧丝杠分别设于左立柱、右立柱外侧，第三数控电机与丝杠下端连接，丝杠与丝杠螺母连接，丝杠螺母与Z轴固定座连接，Z轴固定座与X轴移动系统连接，Z轴固定座设有固定座通孔，左立柱、右立柱从固定座通孔中穿过，所述轴承与立柱导轨配合。结构简单、紧凑，体积小，制作成本低。
The invention discloses a novel 3D printer based on FDM, which includes a frame, a base, an X-axis moving system, a Z-axis moving system, and a printing device. The printing device is connected with the X-axis moving system, and the X-axis moving system and the Z-axis moving system Connection, the Z-axis moving system is connected to the column guide rail, the base is equipped with a power supply and a controller, and the controller is connected to the Z-axis moving system. The Z-axis moving system includes the third CNC motor, the left screw and the right screw, and the Z-axis The fixing seat, the limit switch, the left lead screw and the right lead screw are respectively arranged on the outside of the left column and the right column, the third CNC motor is connected to the lower end of the lead screw, the lead screw is connected to the lead screw nut, and the lead screw nut is connected to the Z axis The fixed seat is connected, the Z-axis fixed seat is connected with the X-axis moving system, the Z-axis fixed seat is provided with a fixed seat through hole, the left column and the right column pass through the fixed seat through hole, and the bearing is matched with the column guide rail. The structure is simple and compact, the volume is small, and the production cost is low.
Description
Technical field
The present invention relates to 3D printer technology field, particularly a kind of novel 3D printer based on FDM.Background technology
Three-dimensional printer is emerging technical development industry, there are purposes and huge market demand more and more widely, three-dimensional DIY crowd is increasing simultaneously, but owing to printing with three-dimensional printer, spare and accessory parts cost is high, efficiency is low, simultaneously due to the 3D printer arrangement more complicated of prior art, volume ratio is comparatively large, structure is not compact, buying and use and maintenance cost higher, limit use market and the scale of consumer.
Summary of the invention
Object of the present invention is exactly the problems referred to above existed for solving prior art, provides a kind of novel 3D printer based on FDM; Structure of the present invention is simple, compact, and volume is little, and cost of manufacture is low, meets the consumption demand of 3D printer growing now.
The technical scheme of technical solution problem of the present invention is:
Based on a novel 3D printer of FDM, comprise frame, base, X-axis mobile system, Y-axis mobile system, Z axis mobile system, printing equipment, described frame comprises the left column of both sides, right column and lower connecting plate, lower connecting plate and left column, right column connects, and base is connected with lower connecting plate, and printing equipment is connected with X-axis mobile system, and X-axis mobile system is connected with Z axis mobile system, left column, right column is provided with column guide rail, and Z axis mobile system is connected with column guide rail, and Y-axis mobile system is connected with base, and described X-axis mobile system is provided with the X-axis moving guide rail of printing equipment movement, and described base bottom is provided with the power supply be connected, controller, controller is connected with power supply, described controller and X-axis mobile system, Y-axis mobile system, Z axis mobile system, printing equipment connects, and described Z axis mobile system comprises two the 3rd numerical-control motors, left side leading screw and right side leading screw, left side Z axis holder and right side Z axis holder, limit switch, described two the 3rd numerical-control motors are located at left column respectively, the base bottom of right column both sides, described left side leading screw, right side leading screw is located at left column respectively, outside right column, 3rd numerical-control motor output shaft protuberate basic unit upper surface is connected with leading screw lower end, leading screw upper end is connected with upper cover, upper cover is connected with upper junction plate, leading screw is connected with feed screw nut, and described feed screw nut is connected with left side Z axis holder and right side Z axis holder respectively, and left side Z axis holder and right side Z axis holder are connected with X-axis mobile system respectively, Z axis holder is provided with holder through hole, left column, right column passes from holder through hole, along left column, the holder through hole both sides of right column two root post center line place plane are respectively equipped with horizontal connecting hole, and be provided with connecting axle in horizontal connecting hole, connecting axle is provided with bearing, and described bearing coordinates with column guide rail, described left side leading screw, right side leading screw axis and left column, right column center line is coplanar in the lateral direction, and the 3rd limit switch is located at column bottom, left side near the upper end surface of base, and the 3rd limit switch coordinates with the lower surface of left side Z axis holder, and described 3rd limit switch is connected with controller.
Described 3rd limit switch is connected with left column by limit switch fixed block, limit switch fixed block top is provided with the perpendicular grooves of mounting limit switch, horizontal groove is being provided with in the middle part of perpendicular grooves, perpendicular grooves bottom is provided with metallic channel, the wire be connected with binding post inside limit switch is outwards derived from metallic channel, and fixed block bottom is provided with body connecting hole, is provided with fixed block body bolt in body connecting hole, fixed block body bolts and nuts coordinate, and nut coordinates with column guide rail; Spring steel wire is provided with in described horizontal groove, described spring steel wire coordinates with the limit switch fixing hole of limit switch, the two ends of spring steel wire and two of horizontal groove sidewall contacts, spring is set to arcuate structure, or middle part and limit switch fixing hole mating part adopt straightway, both sides to bend with middle part respectively, bottom limit switch with contact bottom perpendicular grooves and locate, the end contact of limit switch front end face and column track locating.
Z axis holder top, described left side is provided with the metallic channel along X-axis moving direction, and chassis left side is provided with wire through-hole, and the wire that each described numerical-control motor, limit switch are connected with power supply and controller passes from wire through-hole.
Described printing equipment comprises extrudes printhead, link, feed mechanism, the left and right sides support arm of described link is connected with X-axis moving guide rail, moves axially along X-axis moving guide rail, feed mechanism is arranged on link, extrudes printhead and is connected with link bottom.
Described feed mechanism comprises the 4th numerical-control motor, drive sprocket axle, follower shaft, 4th numerical-control motor output shaft is provided with the first gear, drive sprocket axle is provided with the second gear, first gear and the second gears meshing, supporting seat middle part is along the longitudinal direction provided with the supporting seat slotted eye of up/down perforation, drive sprocket axle is connected with both sides before and after supporting seat by bearing, the centre of drive sprocket axle is provided with printing consumables driving wheel, driven pulley is provided with in the middle of follower shaft, printing consumables driving wheel, driven pulley is located in supporting seat slotted eye, before and after supporting seat, both sides are provided with long slot bore, follower shaft is connected with long slot bore by the back shaft end of both sides, back shaft end is radially provided with through horizontally-guided hole vertical with follower shaft, axis and the follower shaft axis of described pilot hole intersect vertically in horizontal plane, link is provided with driven pulley horizontal level set screw connecting hole, set screw is connected with from set screw connecting hole, the dead in line of set screw connecting hole axis and pilot hole, printing consumables is pressed in printing consumables driving wheel by the second Compress Spring be located in set screw, between follower shaft, the first compression mode is: drive sprocket axle bearing mounting hole and long slot bore are separated by the side between long slot bore and drive sprocket axle bearing mounting hole, after the thin end of set screw stretches out from pilot hole, coordinate with the 3rd Compress Spring, one end of 3rd Compress Spring is connected with long slot bore side, one end coordinates with the step at set screw end rear portion, described set screw is provided with adjusting nut, locking nut, link is also provided with the adjusting hole through with long slot bore, described adjusting nut, locking nut is located at adjusting hole position, by locking nut, set screw and link are fixed, second Compress Spring is located in the set screw between support axle head and adjusting nut, like this after unclamping the second Compress Spring, under the elastic force effect of the 3rd Compress Spring, driven pulley and printing consumables disengage, can the advance and retreat of manual adjustment printing consumables easily, the second compresses mode: drive sprocket axle bearing mounting hole and long slot bore are the structures be communicated with, the end of set screw coordinates with pilot hole, thus omit the 3rd Compress Spring, gap between printing consumables driving wheel and driven pulley outer surface is less than the diameter dimension of printing consumables, described set screw is provided with adjusting nut, locking nut, link is also provided with the adjusting hole through with long slot bore, described adjusting nut, locking nut is located at adjusting hole position, by locking nut, set screw and link are fixed, second Compress Spring is located in the set screw between support axle head and adjusting nut, by the elastic force of the second Compress Spring, printing consumables is pressed between printing consumables driving wheel and driven pulley.
Described controller adopts single-chip microcomputer.
Described 3rd numerical-control motor, the 4th numerical-control motor adopt stepper motor.
The output voltage of described power supply is DC12V dc source.
Described controller, power supply are located at base bottom.
Beneficial effect of the present invention:
1. structure of the present invention is simple, compact, and volume is little, and cost of manufacture is low, meets the consumption demand of 3D printer growing now.
2. compact conformation of the present invention, easy installation and removal, during use, printing consumables is from supporting seat slotted eye, enter the gap between printing consumables driving wheel and driven pulley and pass, driven pulley can adopt bearing empty set to exist, the axis of drive sprocket axle, the axis of follower shaft and the output axis of the 4th numerical-control motor are on same horizontal plane back shaft, by the position of mobile adjusting nut in set screw, adjust the elastic force of the second Compress Spring, make printing consumables at printing consumables driving wheel, different clamping forces is subject between driven pulley, keep printing consumables reliable, be fed to printhead continuously.By being provided with link long slot bore in link both sides, adjusting nut, horizontally-guided hole, driven pulley horizontal level set screw connecting hole, with structures such as the adjusting holes that long slot bore is through, the position of driven pulley can be regulated easily, keep the suitable distance of driven pulley and printing consumables driving wheel, make the frictional force that printing consumables is suitable for, and import downwards in printhead with suitable speed, horizontally-guided hole achieves the axial restraint of follower shaft, avoid the complex structure of other axial restraint and fastening means existence, install and dismantle inconvenience and adjust loaded down with trivial details problem, decrease the size of frame simultaneously, rack construction is compacter: compress mode by the first, after unclamping the second Compress Spring, under the elastic force effect of the 3rd Compress Spring, driven pulley and printing consumables disengage, can the advance and retreat of manual adjustment printing consumables easily, compress mode by the second, omit the 3rd Compress Spring, the gap between printing consumables driving wheel and driven pulley outer surface is less than the diameter dimension of printing consumables, more compact structure, and volume is less.
The connecting line of 3.X axle mobile system, the connecting line of printing equipment pass from metallic channel, when numerical-control motor and printhead move along X-direction, numerical-control motor and sensor conductor pass through its guide effect, relative movement in groove in this metallic channel, wire is neat, avoid wearing and tearing, adds wire dependability.
4. power supply, controller, power interface etc. are located at base bottom, wire unification is passed from wire through-hole, can make full use of base bottom space, center of gravity is low, and base plate top is neat, safe and reliable.
5. keep the pressure between two sidewalls to make the two close contact by the elastic deformation of spring steel wire, spring is set to arcuate structure or middle part and limit switch fixing hole mating part and adopts straightway, both sides bend with middle part respectively, adopt both sides respectively with middle part bending structure, contacted by the pressure of the pre-sizing between the two ends of spring steel wire and two sidewalls of horizontal groove, the sidewall of horizontal groove deforms, make spring steel wire in horizontal groove, have directed auto-lock function, when applying horizontal thrust in the horizontal direction limit switch to binding post side, limit switch moves to binding post side, when applied thrust round about due to the effect of spring steel wire and horizontal groove, there is the microdeformation of local in horizontal groove inwall, stressed more large deformation is larger, there is the auto-lock function in this direction, limit switch does not produce movement.Bottom pot life bit switch with contact bottom perpendicular grooves and locate, the end contact of limit switch front end face and column track is also located, limit switch is located and reliable clamping on limit switch fixed block, coordinated by fixed block body bolts and nuts simultaneously, nut coordinates with column guide rail, by adjusting bolt and nut screw connection elasticity, be easy to regulate the position of limit switch fixed block on column, to adapt to the requirement of the short transverse when printing different product, simultaneously because auxiliary connection board is connected with working face heating plate by buffer structure, working face heating plate also can regulate flatness and height, keep the accurate distance between printhead and working face heating plate, initial molten mass is made to be combined firmly with working face heating plate, ensure the quality printed.Perpendicular grooves bottom is provided with metallic channel, and the wire be connected with binding post inside limit switch is outwards derived from metallic channel, played a protective role, and avoids the fretting wear of wire, simultaneously compact conformation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the sectional view of the first embodiment of A-A of Fig. 1;
Fig. 3 is the sectional view of A-A the second embodiment of Fig. 1;
Fig. 4 is the B-B sectional view of Fig. 1;
Fig. 5 is the A partial view of Fig. 1;
Fig. 6 is limit switch fixed block and limit switch combining structure schematic diagram;
Fig. 7 is the left view of Fig. 6;
Fig. 8 is spring steel wire structural representation.
Detailed description of the invention
In order to understand the present invention better, explain embodiments of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figures 1 to 8, a kind of novel 3D printer based on FDM, comprises frame 1, base 2, X-axis mobile system 3, Y-axis mobile system, Z axis mobile system 5, printing equipment 6, described frame 1 comprises the left column 101 of the left and right sides, right column 102 and lower connecting plate 103, described lower connecting plate 103 and left column 101, right column 102 connects, and base 2 is connected with lower connecting plate 103, and described printing equipment 6 is connected with X-axis mobile system 3, and described X-axis mobile system 3 is connected with Z axis mobile system 5, described left column 101, right column 102 is provided with column guide rail, and Z axis mobile system 5 is connected with column guide rail, and Y-axis mobile system is connected with base 2, and described X-axis mobile system 3 is provided with the X-axis moving guide rail of printing equipment movement, is provided with the power supply be connected bottom described base 2, controller, controller is connected with power supply, described controller and X-axis mobile system 3, Y-axis mobile system, Z axis mobile system 5, printing equipment 6 connects, described controller, power supply is located at base bottom, and the output voltage of described power supply is DC12V dc source.Described controller adopts single-chip microcomputer, described Z axis mobile system 5 comprises two the 3rd numerical-control motors 501, left side leading screw and right side leading screw 502, left side Z axis holder and right side Z axis holder 503, limit switch 505, described 3rd numerical-control motor 501 is located at left column 101, the base bottom of right column 102 both sides, described left side leading screw, left column 101 is located at respectively by right side leading screw 502, outside right column 102, 3rd numerical-control motor output shaft protuberate basic unit upper surface is connected with leading screw lower end, leading screw upper end is connected with upper cover 503, upper cover 503 is connected with upper junction plate 104, leading screw 502 is provided with feed screw nut 504, described feed screw nut 504 is connected with left side Z axis holder and right side Z axis holder 503 respectively, left side Z axis holder and right side Z axis holder 503 are connected with X-axis mobile system 3 respectively, Z axis holder 503 is provided with holder through hole 507, left column 101, right column 102 passes from holder through hole 507, along left column 101, the holder through hole both sides of right column 102 liang of root post center line place planes are respectively equipped with horizontal connecting hole, connecting axle 509 is provided with in horizontal connecting hole, connecting axle is provided with bearing 508, described bearing 508 coordinates with column guide rail 105, described left side leading screw, right side leading screw axis and left column 101, right column 102 center line is coplanar in the lateral direction, 3rd limit switch 505 is located at column bottom, left side near the upper end surface of base, 3rd limit switch 505 coordinates with the lower surface of left side Z axis holder 503, described 3rd limit switch 505 is connected with controller.
Described 3rd limit switch 505 is connected with left column 101 by limit switch fixed block 510, described limit switch fixed block 510 top is provided with the perpendicular grooves 5101 of mounting limit switch, horizontal groove 5102 is being provided with in the middle part of perpendicular grooves 5101, perpendicular grooves bottom is provided with metallic channel 5103, the wire 5108 be connected with binding post 5109 inside limit switch is outwards derived from metallic channel 5103, fixed block bottom is provided with body connecting hole 5104, fixed block body bolt 5105 is provided with in body connecting hole 5104, fixed block body bolt 5105 coordinates with nut 5106, nut 5106 coordinates with column guide rail 105, spring steel wire 5107 is provided with in described horizontal groove 5102, described spring steel wire 5107 coordinates with the limit switch fixing hole of limit switch, the two ends of spring steel wire 5107 and two sidewall contacts of horizontal groove 5102, the pressure between two sidewalls is kept to make the two close contact by the elastic deformation of spring steel wire 5107, for increasing spring force, spring is set to arcuate structure or middle part and limit switch fixing hole mating part and adopts straightway, both sides bend with middle part respectively, adopt both sides respectively with middle part bending structure, contacted by the pressure of the pre-sizing between the two ends of spring steel wire 5107 and two sidewalls of horizontal groove 5102, the sidewall of horizontal groove 5102 deforms, make spring steel wire 5107 in horizontal groove 5102, have directed auto-lock function, when applying horizontal thrust in the horizontal direction limit switch to binding post 5109 side, limit switch moves to binding post 5109 side, when applied thrust round about due to spring steel wire 5107 and the effect of horizontal groove 5102, there is the microdeformation of local in horizontal groove 5102 inwall, stressed more large deformation is larger, there is the auto-lock function in this direction, limit switch does not produce movement.Bottom pot life bit switch with contact bottom perpendicular grooves 5101 and locate, the end contact of limit switch front end face and column track is also located, limit switch is located and reliable clamping on limit switch fixed block 510, coordinated with nut 5106 by fixed block body bolt 5105 simultaneously, nut 5106 coordinates with column guide rail 105, by adjusting bolt and nut screw connection elasticity, be easy to regulate the position of limit switch fixed block 510 on column, to adapt to the requirement of the short transverse when printing different product, simultaneously because auxiliary connection board is connected with working face heating plate by buffer structure, working face heating plate also can regulate flatness and height, keep the accurate distance between printhead and working face heating plate, initial molten mass is made to be combined firmly with working face heating plate, ensure the quality printed.
Z axis holder 503 top, left side is provided with the metallic channel 506 along X-axis moving direction, chassis left side is provided with wire through-hole 207, the wire of each numerical-control motor, limit switch and sensor passes from wire through-hole 207, the connecting line of X-axis mobile system 3, the connecting line of printing equipment 6 pass from metallic channel 506, when numerical-control motor and printhead move along X-direction, numerical-control motor and sensor conductor pass through its guide effect, relative movement in groove in this metallic channel 506, wire is neat, avoid wearing and tearing, adds wire dependability.。Power supply, controller, power interface etc. are located at base bottom, and wire unification is passed from wire through-hole 207, can make full use of base bottom space, center of gravity is low, and base plate top is neat, safe and reliable.
Described printing equipment 6 comprises extrudes printhead 601, link 602, feed mechanism 603, the left and right sides support arm 604 of described link 602 is connected with X-axis moving guide rail, moves axially along X-axis moving guide rail, feed mechanism 603 is arranged on link 602, extrudes printhead 601 and is connected with link 602 bottom.
Described feed mechanism 603 comprises the 4th numerical-control motor 6031, drive sprocket axle 6032, follower shaft 6033, 4th numerical-control motor output shaft is provided with the first gear 6034, drive sprocket axle 6032 is provided with the second gear 6035, first gear 6034 engages with the second gear 6035, supporting seat 606 middle part is along the longitudinal direction provided with the supporting seat slotted eye 6036 of up/down perforation, drive sprocket axle 6032 is connected with both sides before and after supporting seat by bearing, the centre of drive sprocket axle 6032 is provided with printing consumables driving wheel 6037, driven pulley 6038 is provided with in the middle of follower shaft 6033, printing consumables driving wheel 6037, driven pulley 6038 is located in supporting seat slotted eye 6036, before and after supporting seat, both sides are provided with long slot bore 6039, follower shaft 6033 is connected with long slot bore 6039 by the back shaft end of both sides, back shaft end is radially provided with through horizontally-guided hole 6040 vertical with follower shaft, axis and follower shaft 6033 axis of described pilot hole 6040 intersect vertically in horizontal plane, link is provided with driven pulley horizontal level set screw connecting hole, set screw 6041 is connected with from set screw connecting hole, the dead in line of set screw connecting hole axis and pilot hole 6040, after the thin end of set screw 6041 stretches out from pilot hole 6040, coordinate with the 3rd Compress Spring 6046, one end of 3rd Compress Spring 6046 is connected with long slot bore 6039 side, one end coordinates with the step 6047 at set screw 6041 end rear portion, described set screw 6041 is provided with adjusting nut 6042, locking nut 6043, link is also provided with the adjusting hole 6044 through with long slot bore, described adjusting nut 6042, locking nut 6043 is located at adjusting hole position, by locking nut 6043, set screw 6041 and link are fixed, set screw between support axle head and adjusting nut is provided with the second Compress Spring 6045.During use, printing consumables is from supporting seat slotted eye 6036, enter the gap between printing consumables driving wheel 6037 and follower shaft 6033 and pass, driven pulley can adopt bearing empty set to exist, the axis of drive sprocket axle, the axis of follower shaft and the output axis of the 4th numerical-control motor are on same horizontal plane back shaft, by the mobile position of adjusting nut 6042 in set screw 6041, adjust the elastic force of the second Compress Spring 6045, make printing consumables at printing consumables driving wheel 6037, different clamping forces is subject between driven pulley 6038, keep printing consumables reliable, be fed to printhead continuously.By being provided with link long slot bore 6039 in link both sides, adjusting nut 6042, horizontally-guided hole 6040, driven pulley horizontal level set screw connecting hole, with structures such as the adjusting holes 6044 that long slot bore is through, the position of driven pulley can be regulated easily, keep the suitable distance of driven pulley and printing consumables driving wheel, make the frictional force that printing consumables is suitable for, and import downwards in printhead with suitable speed, and the axial restraint of follower shaft is achieved by horizontally-guided hole, avoid the complex structure of other axial restraint and fastening means existence, install and dismantle inconvenience and adjust loaded down with trivial details problem, decrease the size of frame simultaneously, rack construction is compacter.Described 3rd numerical-control motor, the 4th numerical-control motor adopt stepper motor.
By reference to the accompanying drawings the detailed description of the invention of invention is described although above-mentioned; but not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (6)
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| CN201410081889.0A CN103802322B (en) | 2014-03-07 | 2014-03-07 | New 3D printer based on FDM |
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| CN201410081889.0A CN103802322B (en) | 2014-03-07 | 2014-03-07 | New 3D printer based on FDM |
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| CN104399977B (en) * | 2014-05-31 | 2016-06-01 | 福州大学 | The 3D printer of a kind of direct-current machine and stepper-motor combination drive |
| JP6411785B2 (en) * | 2014-06-18 | 2018-10-24 | 株式会社放電精密加工研究所 | 3D modeling equipment |
| SG11201700024UA (en) | 2014-07-09 | 2017-02-27 | Applied Materials Inc | Layerwise heating, linewise heating, plasma heating and multiple feed materials in additive manufacturing |
| CN104260352A (en) * | 2014-09-23 | 2015-01-07 | 济南大学 | Mini 3D (three-dimensional) printer adopting FDM (frequency-division multiplexing) technology |
| CN104821477B (en) * | 2015-06-01 | 2018-05-25 | 中国工程物理研究院激光聚变研究中心 | A kind of device and method for printing laser crystal cooling heat sink |
| JP6855460B2 (en) * | 2015-09-16 | 2021-04-07 | アプライド マテリアルズ インコーポレイテッドＡｐｐｌｉｅｄ Ｍａｔｅｒｉａｌｓ，Ｉｎｃｏｒｐｏｒａｔｅｄ | Adjustable Z-axis printhead module for additive manufacturing systems |
| CN106239909A (en) * | 2016-07-28 | 2016-12-21 | 沈方平 | A kind of 3D print system |
| US11002530B2 (en) | 2016-09-20 | 2021-05-11 | Applied Materials, Inc. | Tiltable platform for additive manufacturing of a polishing pad |
| CN106564185B (en) * | 2016-11-17 | 2019-04-09 | 天津大学 | A portable 3D printer for tidal energy turbine blades |
| CN108724709A (en) * | 2017-04-17 | 2018-11-02 | 北京文泽科技开发有限公司 | Novel 3D printer |
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