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WO2019019882A1 - Buse d'imprimante 3d à double ouverture - Google Patents

Buse d'imprimante 3d à double ouverture Download PDF

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Publication number
WO2019019882A1
WO2019019882A1 PCT/CN2018/094272 CN2018094272W WO2019019882A1 WO 2019019882 A1 WO2019019882 A1 WO 2019019882A1 CN 2018094272 W CN2018094272 W CN 2018094272W WO 2019019882 A1 WO2019019882 A1 WO 2019019882A1
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WO
WIPO (PCT)
Prior art keywords
block
wall
extrusion port
discharge
guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/094272
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English (en)
Chinese (zh)
Inventor
张玲玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Su Yanmin
Original Assignee
Su Yanmin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Su Yanmin filed Critical Su Yanmin
Publication of WO2019019882A1 publication Critical patent/WO2019019882A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor

Definitions

  • the invention relates to a 3D printer extrusion port, in particular to a double-caliber, variable flow type 3D printer extrusion port.
  • a 3D printer is a cumulative manufacturing technology, a machine for rapid prototyping. It is a digital model file based on a special layer of wax, powdered metal or plastic that can be bonded to a layer of Adhesive materials are used to make three-dimensional objects, and stage 3D printers use layer-by-layer printing to construct and manufacture products.
  • the 3D printer extrusion port is used for extruding the bonding material from the storage chamber to the printing work.
  • the existing printer extrusion port adopts a fixed diameter and a fixed amount of the bonding material extruded from the extrusion port per unit time, and the defect thereof ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
  • the object of the present invention is to provide a printing process with two caliber 3D printer extrusion ports and different caliber switching without interrupting the printer, and the invention also has a flow controllable function and can be printed according to actual conditions. It is necessary to adjust the amount of extrusion per unit time of the extrusion port.
  • the utility model relates to a double-caliber 3D printer nozzle, which comprises an outer wall of an extrusion port and a discharge tube.
  • the outer wall of the extrusion port is tapered and is provided with a cavity coaxial with the outer wall of the extrusion port, and the discharge pipe can be injected into the inner cavity of the outer wall of the extrusion port.
  • the lower end side wall of the discharge pipe is provided with ten discharge holes in the circumferential direction and the adjacent discharge holes are evenly spaced, the annular sealing block is arranged above the discharge hole and the annular sealing block is coaxial with the discharge pipe
  • the annular sealing block is matched with the upper portion of the inner wall of the extrusion port and sealed, and the annular sealing block is movable along the axis of the outer wall of the extrusion port.
  • the lower end of the discharge pipe is connected with a control mechanism and the control mechanism is received in the space formed by the annular sealing block and the outer wall of the extrusion port.
  • the control mechanism comprises a restriction block, the restriction block is coaxially connected to the lower end of the discharge tube and the restriction block is in the form of a coaxial double circular table, and the radius of the restriction block is gradually increased from the top to the bottom of the circular table.
  • the first and second guide holes are arranged on the restriction block, and the plurality of guide holes are arranged on the restriction block.
  • the guiding hole is disposed on the circular table at the upper part of the limiting block, and the first guiding hole can be connected to the outer hole formed by the annular sealing block and the outer wall of the extrusion port and the discharging hole disposed at the lower end of the discharging tube, the second guiding material
  • the hole is coaxially disposed at the bottom of the lower round table of the restriction block and the second guide hole communicates with the first guide hole, the bottom of the outer wall of the extrusion port is provided with an extrusion port and the extrusion port communicates with the inner cavity of the outer wall of the extrusion port, and the extrusion port and the outlet
  • the second guide orifice is coaxial and the radius of the extrusion port is matched to the radius of the lower circular table of the restriction block and the diameter of the second guide orifice is smaller than the diameter of the extrusion bore.
  • a middle portion of the discharge tube is provided with a guiding mechanism, and a guiding end of the guiding mechanism is connected with an output end of the driving mechanism and can drive the discharge tube to move along a direction of the axis thereof, and the guiding mechanism can be used for guiding the discharging tube and the traction limit
  • the block moves along the central axis of the outer wall of the extrusion port, and the size of the opening of the outer wall of the extrusion port can be adjusted.
  • the guiding mechanism comprises a dial arranged on the wall of the discharge tube, the dial block is symmetrically arranged along the axis of the discharge tube and the axis of the dial block is distributed along the radial direction of the discharge tube, the dial block and the driving mechanism Output end connection: the output end of the drive mechanism can push the dial block and pull the discharge tube to move along its own axis, so that the lower round table of the restriction block and the outer wall of the extrusion port can be switched from the matching state to the disengaged state, or the lower part of the restriction block The round table and the outer wall of the extrusion port are switched from the disengaged state to the matched state.
  • the driving mechanism comprises a motor and a guiding block, and an output shaft end of the motor is connected to the guiding block and can drive the guiding block to move in a direction perpendicular to a central axis of the arranging tube, and the guiding block is disposed on the mounting tube wall
  • the matching block of the dial block can push the dial block and the traction arrangement tube to move along the central axis during the translation process of the guide block, and the drive block and the connecting limit block move along the axis of the discharge tube during the movement of the discharge tube and Adjust the gap between the restriction block and the outer wall of the extrusion port.
  • the double-caliber, variable-flow 3D printer extrusion port of the invention has the functions of adjustable extrusion port radius and adjustable extrusion flow rate; Translating and guiding the block to be displaced relative to the discharge tube along the length of the first escape groove during the translation of the guide block, and the discharge tube driving the connected restriction block to move away from the outer wall of the extrusion port during the movement of the discharge tube.
  • the extrusion radius is changed from the radius of the second guide hole to the radius of the extrusion port on the outer wall of the extrusion port, thereby realizing the function of increasing the extrusion radius and increasing the extrusion amount.
  • Figure 1 is a schematic view of the overall structure of the present invention.
  • Figure 2 is a schematic cross-sectional view showing a first state of the present invention.
  • Figure 3 is a schematic cross-sectional view showing a second state of the present invention.
  • Figure 4 is a schematic view of the guide mechanism of the present invention.
  • Figure 5 is a schematic view of the drive mechanism of the present invention.
  • Figure 6 is a schematic view of the drive mechanism of the present invention.
  • a double-caliber, variable-flow 3D printer extrusion port includes a guiding mechanism 10, a driving mechanism 20, a heating mechanism 30, and a storage mechanism 40.
  • the storage mechanism 40 is provided with a cavity and a cavity. A consumable for printing the workpiece is stored, and a discharge end at the bottom of the storage mechanism 40 is connected to a feeding end of a portion of the guiding mechanism 10, and the guiding mechanism 10 is for squeezing the consumable from the storage mechanism 40 to the position
  • the printing working surface below the discharge end of the guiding mechanism 10, the middle portion of the guiding mechanism 10 is provided with a heating mechanism 30 for providing heat source for melting the consumables, and the guiding mechanism 10 further comprises a control mechanism and a guiding mechanism, the control mechanism is installed on The bottom of the guiding mechanism can be used to control the extrusion diameter and the extrusion flow rate of the consumables.
  • the guiding mechanism is disposed in the middle of the guiding mechanism 10, and the guiding end of the guiding mechanism is connected to the output end of the driving mechanism 20 and driven by The output of the mechanism 20 can drive the leading end of the guiding mechanism to be displaced in the direction of the guide.
  • the consumable may be any one or more of a bonding plastic, a photosensitive gum, a metal powder, a ceramic, and an edible fat.
  • the guiding mechanism 10 includes an outer wall 11 for the extrusion port and a discharge tube 12, and the outer wall 11 of the extrusion port is tapered and provided with a cavity coaxial with the outer wall 11 of the extrusion port.
  • the discharge pipe 12 communicates with the discharge end of the bottom of the storage mechanism 40, and the lower end side wall of the discharge pipe 12 is provided with a plurality of discharge holes in the circumferential direction and the adjacent discharge holes are evenly spaced, and the discharge holes are arranged above the discharge hole.
  • annular sealing block 13 there is an annular sealing block 13 and the annular sealing block 13 is coaxial with the discharge tube 12, the annular sealing block 13 is matched and sealed with the upper portion of the inner wall of the extrusion port outer wall 11 and the annular sealing block 13 is movable along the axis of the outer wall 11 of the extrusion port.
  • a control mechanism is connected to the lower end of the tube 12 and the control mechanism is received in a cavity formed by the annular sealing block 13 and the outer wall 11 of the extrusion crucible.
  • the control mechanism includes a restriction block 14 coaxially connected to the discharge tube.
  • the lower end of 12 and the restriction block 14 are coaxial double-circular table shape, and the restriction block 14 is gradually increased from the top to the bottom of the circular table first and then gradually decreases, and the round table bus bar at the lower portion of the restriction block 14 is parallel to the bus bar of the outer wall 11 of the extrusion port.
  • the restriction block 14 is provided with a plurality of guide holes, the guide The material hole includes a plurality of first guiding holes and a second guiding hole, the first guiding hole is disposed on the circular table of the upper portion of the limiting block 14, and the first guiding hole is formed by the annular sealing block 13 and the extruded outer wall 11
  • the cavity is matched with the discharge hole disposed at the lower end of the discharge tube 12, the second guide hole is coaxially disposed at the bottom of the lower round table of the restriction block 14, and the second guide hole is in communication with the first guide hole, and is squeezed
  • the bottom of the outlet outer wall 11 is provided with an extrusion port and the extrusion port communicates with the inner cavity of the outer wall 11 of the extrusion port, the extrusion port is coaxial with the second guide hole and the radius of the extrusion port matches the radius of the lower table of the restriction block 14 and the second guide
  • the diameter of the hole is smaller than the diameter of the extrusion port.
  • the middle of the discharge tube 12 is provided with a guiding mechanism.
  • the guiding end of the guiding mechanism is connected with the output end of the driving mechanism 20 and can drive the discharge tube 12 to move in the direction of its own axis.
  • the guiding mechanism can be used for guiding the row.
  • the material tube 12 and the traction restriction block 14 are moved in the direction of the central axis of the outer wall 11 of the extrusion port, so that the adjustment of the opening size of the outer wall 11 of the extrusion crucible can be achieved.
  • the adjacent first guide holes are evenly spaced and the axis of the first guide hole is perpendicular to the side of the truncated cone on the restriction block 14.
  • the guiding mechanism includes a dial 15 disposed at a wall portion of the discharge tube 12, the dial 15 is symmetrically disposed along the axis of the discharge tube 12, and the axis of the dial 15 is distributed along the radial direction of the discharge tube 12.
  • the dial block 15 is connected to the output end of the driving mechanism 20; when the discharge tube 12 moves along its own axis, the lower circular table of the restriction block 14 and the outer wall 11 of the extrusion port can be switched from the matching state to the disengaged state, or the limiting block can be made. The lower circular table 14 and the extruded outer wall 11 are switched from the disengaged state to the matched state.
  • the driving mechanism 20 includes a motor 21 and a guiding block 22, and the first blocking groove and the second avoiding groove are respectively disposed on the searching block 22, and the center lines of the first avoiding groove and the second avoiding groove are respectively respectively respectively.
  • the large surface of the vertical guiding block 22, the center line of the longitudinal direction of the first escape groove is perpendicular to the axis of the discharge tube 12, and the center line of the longitudinal direction of the first escape groove is collinear/parallel to the center line of the longitudinal direction of the second escape groove,
  • a escaping groove is provided for the discharge tube 12 to pass through and the guiding block 22 is movable along the length of the first escaping groove.
  • the first escaping groove is provided with guide rails on both sides thereof and the center line of the guide rail depth direction is perpendicular to the axis of the discharge tube 12, and the guide rail is
  • the guide rail can push the dial block 15 and pull the discharge tube 12 to move along the axial direction thereof, and the output shaft and the guiding block of the motor 21 22 is connected and the motor can provide a rotational force to drive the guiding block 22 to translate the guiding direction of the guiding block 22 to the vertical rail depth direction centerline.
  • the heating mechanism 30 is connected to the discharge pipe 12 and can heat the consumables in the discharge pipe 12.
  • the heating mechanism 30 includes a casing, and the casing is provided with a discharge pipe 12 and a guide.
  • the inner chamber of the block 22 and the housing inner chamber are provided with a heat source along the axial direction of the discharge tube 22.
  • the storage mechanism 40 includes a storage chamber for storing consumables.
  • the outer wall of the storage chamber is coaxially provided with a plurality of annular fins and adjacent annular fins are evenly spaced;
  • the consumables in the storage chamber dissipate heat to prevent the consumables in the storage chamber from being thermally transferred by the dither tube 12 and causing excessive temperature to cause damage and softening of the consumables in the storage chamber.
  • the dial 15 In operation, in the first working state, the dial 15 is located at one end of the guide rail near the second escape groove, and at this time, the gap between the lower round table of the restriction block 14 and the outer wall 11 of the extrusion port has a gap through which the consumables pass and the discharge radius of the extrusion port
  • the heating mechanism 30 operates and the heat source heats the consumables transported by the discharge pipe 12, and the consumption after heating is discharged from the discharge hole at the bottom of the discharge pipe 12 to the annular seal block 13 and the outer wall 11 of the extrusion port and the material limit.
  • the consumables in the cavity are respectively pressed to the extrusion port through the gap between the outer wall 11 of the extrusion port and the lower round table of the restriction block 14 and the guide hole of the restriction block 14 and extruded by the crucible Extrude to the print work surface.
  • the motor 21 In the second working state, when the printing precision needs to be improved and the consumable extrusion radius needs to be reduced, the motor 21 operates, and the output shaft of the motor 21 drives the guiding block 22 to move toward the motor 21 in the longitudinal direction center line of the first escape groove and the first
  • the second escape groove is configured to extend along the axis of the second escape groove toward the end of the first escape groove, and the guide block 22 is relatively displaced from the discharge pipe 12 during the movement of the first escape groove, and is disposed on the guide block 22
  • the guide rail applies a force to the dial block 15 in the longitudinal direction of the vertical rail and the force is directed by the dial block 15 toward the outer wall 11 of the extrusion jaw.
  • the dial block 15 moves along the axis of the discharge tube 12 toward the outer wall 11 of the extrusion port under the force of the guide rail 15 .
  • the discharge tube 12 connected thereto is driven to move toward the extrusion port along its own axis and drive the restriction block 14 to move toward the extrusion port.
  • the restriction block 14 moves to the extrusion port
  • the restriction block The lower circular table of 14 is sealingly matched with the side surface of the outer wall 11 of the extrusion port, and the bottom surface of the lower circular table is flush with the extrusion port, and the extrusion radius of the extrusion port is the lower circular table of the restriction block 14
  • the radius of the second guide hole and the radius of the extrusion port result in a decrease in the extrusion amount of the consumables under the same pressure state, and the consumables are transported by the storage mechanism 40 through the discharge pipe 12 to the annular seal block 13 and the outer wall 11 of the extrusion port.
  • the cavity formed by the upper circular table of the block 14 is inserted into the cavity and then extruded from the guide hole of the restriction block 14 to the printing work surface and cooled and formed on the printing work surface.
  • the outer wall 11 of the extrusion port is connected to the housing of the heating mechanism 30 through the threaded connection member 16, and the threaded connection member 16 is coaxially sleeved on the discharge tube 12, and the heating mechanism 30 is provided with a mounting hole and a mounting hole and a discharge material.
  • the tube 12 is coaxial, the threaded connection member 16 includes an upper threaded connection member, a lower threaded connection member and the upper threaded connection member is mated with the mounting hole of the housing of the heating mechanism 30, and the lower threaded connection member is matched with the end of the extrusion port outer wall 11 away from the extrusion port;
  • the upper threaded connection sleeve sleeved on the outside of the discharge tube 12 can stabilize the discharge tube 12 and avoid the radial runout of the discharge tube 12, and the outer wall 11 of the extrusion port is heated by providing the threaded connection member 16.
  • the mechanism 30 is fixed and the whiteness of the discharge tube 12 in its circumferential direction is zero.
  • the discharge tube 12 is freed in the circumferential direction by the threaded connection member 16.
  • the degree of limitation ensures that the discharge tube 12 is displaced only in its circumferential direction when driven by the block 15, and the lower circular table of the restriction block 14 can be matched with the tapered surface of the outer wall of the extrusion port to ensure stable operation without preparation.
  • a printing method for a dual-caliber, variable-flow 3D printer the steps of which include:
  • the restriction block 14 is in a matching sealing state with the inner wall of the outer wall 11 of the extrusion port, and the extrusion radius is the radius of the second guide hole.
  • the power is turned on, and the heat source in the heating mechanism 30 heats the consumables located in the discharge pipe 12 to the melt.
  • the molten state consumables are discharged from the discharge end of the storage mechanism 40 along the axis of the discharge pipe 12 toward the bottom of the discharge pipe 12, and are discharged into the outer wall 11 of the extrusion port by the discharge hole at the lower end of the discharge pipe 12. a sealing block 13 and a cavity formed by the restriction block 14;
  • the radius of the limiting block gradually increases from the top to the bottom of the circular table and then gradually decreases and the lower part of the limiting block is rounded.
  • the bus bar is parallel with the bus bar of the outer wall of the extruded crucible, and the limiting block is provided with a plurality of guiding holes, the guiding hole comprises a plurality of first guiding holes and a second guiding hole, and the first guiding hole is disposed at the limiting material a circular table on the upper part of the block, the first guide hole can be connected to the outer hole formed by the outer wall of the extrusion port through the bad seal block and the discharge hole disposed at the lower end of the discharge pipe, and the second guide hole is coaxially disposed at the limit a bottom portion of the lower round table of the block and a second guide hole communicating with the first guide hole; so that the molten state consumable in the outer wall 11, the annular seal block 13 and the restriction block 14 forming the cavity are formed by the second guide hole Extrusion out of the extrusion port 11;
  • the motor 21 When the printing accuracy requirement is lowered or the extrusion radius needs to be increased, the motor 21 is operated, and the output shaft of the motor 21 drives the guiding block 22 connected thereto to move in a direction perpendicular to the central axis of the discharge tube 12, and the guiding block 22 is disposed.
  • the connecting restriction block 14 moves along the axis of the discharge tube 12 in a direction away from the outer wall 11 of the extrusion port and creates a gap between the restriction block 14 and the outer wall 11 of the extrusion port, and the extrusion radius is the radius of the extrusion port of the outer wall 11 of the extrusion port.
  • the molten state consumables located in the cavity formed by the extruded outer wall 11, the annular sealing block 13 and the restriction block 14 respectively pass through the gap between the restriction block 14 and the outer wall 11 of the extrusion port, and the second guide of the restriction block 14 The hole is squeezed to the extrusion port and squeezed by the squeeze port to print work.
  • the annular fin of the outer wall of the storage chamber can dissipate the consumables in the storage chamber, prevent the consumables in the storage chamber from being thermally conducted by the discharge tube 12 and cause the temperature to be too high to cause the storage chamber. Damage and softening of internal consumables.
  • step S3 when the guide rail driving block 15 moves toward the bottom of the guiding block 22 and drives the discharge tube 12 to move toward the outer wall 11 of the extrusion port, the outer wall of the extrusion port passes through the screw connection member and the heating mechanism housing.
  • the threaded connection comprises an upper threaded connection, a lower threaded connection and the upper threaded connection is matched with the mounting hole of the heating mechanism housing, the lower threaded connection and the outer wall of the extrusion port Keeping away from the end of the extrusion port; the threaded connection 16 acts as a stabilizing effect on the discharge tube 12 and avoids the radial runout of the discharge tube 12; the degree of freedom of the discharge tube 12 in the circumferential direction is achieved by the threaded connection 16
  • the limitation ensures that the discharge pipe 12 is displaced only in its circumferential direction when driven by the dial block 15.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)

Abstract

La présente invention concerne une buse d'imprimante 3D à double ouverture, comprenant une paroi externe d'orifice d'extrusion et un tuyau de sortie ; la paroi externe d'orifice d'extrusion est conique et pourvue d'une cavité interne coaxiale à la paroi externe d'orifice d'extrusion, le tuyau de sortie peut injecter des produits consommables en fusion dans la cavité interne de la paroi externe d'orifice d'extrusion, la paroi latérale au niveau de l'extrémité inférieure du tuyau de sortie est pourvue de plusieurs trous de sortie dans la direction circonférentielle et des trous de sortie adjacents sont espacés de façon régulière d'un intervalle donné et l'extrémité inférieure du tuyau de sortie est reliée à un mécanisme de commande, le mécanisme de commande étant logé dans une cavité formée par un bloc d'étanchéité annulaire et la paroi externe d'orifice d'extrusion, le mécanisme de commande comprenant un bloc de limitation de matériau relié de manière coaxiale à l'extrémité inférieure du tuyau de sortie ; le bloc de limitation de matériau a une forme de table double-circulaire coaxiale, le rayon de table circulaire du bloc de limitation de matériau, de haut en bas, augmente progressivement puis diminue progressivement et le bloc de limitation de matériau est pourvu de plusieurs premiers trous de guidage de matériau et de deuxièmes trous de guidage de matériau, les premiers trous de guidage de matériau étant situés sur la table circulaire supérieure du bloc de limitation de matériau et en mesure de communiquer avec les trous de sortie situés au niveau de l'extrémité inférieure du tuyau de sortie au moyen de la cavité formée par le bloc d'étanchéité annulaire et la paroi externe d'orifice d'extrusion.
PCT/CN2018/094272 2017-07-27 2018-07-03 Buse d'imprimante 3d à double ouverture Ceased WO2019019882A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710625817.1A CN107214958B (zh) 2017-07-27 2017-07-27 一种双口径3d打印机喷头
CN201710625817.1 2017-07-27

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WO2019019882A1 true WO2019019882A1 (fr) 2019-01-31

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CN107214958B (zh) * 2017-07-27 2018-06-26 苏艳敏 一种双口径3d打印机喷头
CN109397687B (zh) * 2018-11-27 2020-12-01 安徽工程大学 一种口径可调的3d打印笔
CN110181810B (zh) * 2019-07-03 2024-07-30 常州工业职业技术学院 一种可控流量的3d打印石墨烯复合材料喷头
CN116461088A (zh) * 2023-03-24 2023-07-21 袁烽 3d打印挤出喷头及3d打印装置

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EP3085518A1 (fr) * 2015-03-04 2016-10-26 Technology Research Association For Future Additive Manufacturing Buse d'usinage, tête d'usinage, équipement d'usinage, et procédé et programme de commande de buse d'usinage
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CN107263854A (zh) * 2017-07-27 2017-10-20 张玲玲 一种双口径、变流量式3d打印机的打印方法

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