KR20170096357A - Apparatus for detecting filament of 3D printer - Google Patents

Apparatus for detecting filament of 3D printer Download PDF

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Publication number
KR20170096357A
KR20170096357A KR1020160017654A KR20160017654A KR20170096357A KR 20170096357 A KR20170096357 A KR 20170096357A KR 1020160017654 A KR1020160017654 A KR 1020160017654A KR 20160017654 A KR20160017654 A KR 20160017654A KR 20170096357 A KR20170096357 A KR 20170096357A
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KR
South Korea
Prior art keywords
filament
unit
driving
roller
output
Prior art date
Application number
KR1020160017654A
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Korean (ko)
Inventor
박재한
한규훈
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주식회사신도리코
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Publication date
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Priority to KR1020160017654A priority Critical patent/KR20170096357A/en
Publication of KR20170096357A publication Critical patent/KR20170096357A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/10—Processes of additive manufacturing
    • B29C64/141—Processes of additive manufacturing using only solid materials
    • 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
    • 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
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)

Abstract

An objective of the present invention is to provide a filament detecting apparatus for a 3D printer, the apparatus which is capable of confirming if the filament is cut or exhausted by detecting if there is a filament supplied toward a filament output unit. The other objective of the present invention is to provide the filament detecting apparatus for the 3D printer, the apparatus which is capable of guiding an entry path of the filament supplied toward the filament output unit. The 3D printer includes: a filament supply unit which coils a wire-shaped filament and supplies the coiled filament; a filament output unit which melts and discharges the filament supplied from a filament cartridge to output three-dimensional prints; and a driving unit which supplies the filament from the filament supply unit to the filament output unit, and discharges the filament in a direction of the filament supply unit from the filament output unit. The filament detecting apparatus for the 3D printer according to the present invention comprises a sensor unit which is provided at a front end of the filament output unit to detect if there is the filament, and the sensor unit comprises: an optical sensor which includes a light emitting unit and a light receiving unit which are installed in a direction of facing each other around the filament, and detects if there is the filament; and a rotating member which is rotationally installed at the front end of the filament output unit, and is rotated by the filament to selectively block a light irradiated toward the filament from the optical sensor.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a filament detecting apparatus for a three-

The present invention relates to a filament detecting device for a three-dimensional printer, which detects a filament fed from a cartridge to a filament output portion side to check whether the filament is cut off or exhausted.

In general, in order to produce a prototype having a three-dimensional solid shape, a method of making a cooperative work by hand and a production method by CNC milling are widely known depending on the drawing.

However, since the method of making the woodwork is by hand, elaborate numerical control is difficult and time consuming, and CNC milling can produce precise numerical control, but there are many shapes that are difficult to process due to tool interference.

In recent years, a product designer has created 3D modeling data using CAD or CAM, and has developed a so-called three-dimensional printing method for producing prototypes of three-dimensional shapes using the generated data. Industry, life, medicine and so on.

A 3D printer is a manufacturing apparatus for producing objects by outputting successive layers of materials as a two-dimensional printer and stacking them. 3D printers can be used to create prototypes quickly because they can be quickly created based on digitized drawing information.

The product molding method of the 3D printer includes a method of molding a light-scraped material with a laser beam to form a light-shaded portion, an extrusion molding method, and a method of melting and laminating a thermoplastic filament (FDM) have.

Among such methods, 3D printers using filaments in a molten state are less expensive than other types of 3D printers, and therefore, 3D printers using filaments are becoming popular for home and industrial use.

Korean Patent Laid-Open Publication No. 10-2014-0121034 discloses a method for producing a filament, which comprises a flexible shaft connected to a power motor to transmit power, a feeder roller connected to a flexible shaft and rotatable, a filament fed by rotation of a feeder roller, Disclosed is a three-dimensional printer apparatus including a hot-end nozzle configured to melt and spray and to feed the filament uniformly, stably, and at a high speed to a hot-end nozzle.

Here, the three-dimensional printer apparatus and the conventional three-dimensional printers disclosed in the above prior art documents can be used even when the filament fed to the hot end nozzle (extruder) side of the cartridge is broken or the filament of the cartridge is exhausted, And continues to be driven. Therefore, an output failure occurs in which the three-dimensional output is incompletely generated, and such output failure causes a problem that the output operation of the three-dimensional output must be performed again from the beginning.

Disclosure of the Invention The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a filament detecting device for a three-dimensional printer, which can detect whether a filament is cut or exhausted by detecting the presence or absence of a filament fed to a filament output part .

It is another object of the present invention to provide a filament detecting device for a three-dimensional printer capable of guiding the entry path of a filament fed to a filament output section.

In order to achieve the above object, the present invention provides a filament feeding device comprising: a filament supply part for winding a filament in a wire form and supplying a filament wound; A filament output unit for outputting a three-dimensional printed matter by transferring and melting and discharging filaments supplied from the filament cartridge; And a driving unit that supplies a filament to the filament output unit from the filament supply unit and discharges the filament from the filament output unit to the filament supply unit, the three-dimensional printer comprising: Wherein the sensor unit comprises a light sensor having a light emitting unit and a light receiving unit provided in a direction facing each other with respect to the filament, and detecting the presence or absence of the filament; And a tiltable member which is rotatably provided at the tip of the filament output portion and which is rotated by the filament to selectively block light emitted from the photosensor to the filament side.

Preferably, the pivoting member comprises: a pivot shaft provided on the feeding path of the filament so as to be rotatable in a direction perpendicular to the feeding path of the filament; A rotation flap extending radially outwardly from the rotation axis, the rotation flap being selectively positioned between the optical sensor and the filament; And a connecting member which extends in a direction opposite to the turning flap along the radial direction from the pivot shaft, interrupts the feeding path of the filament when no filament is present, and rotates upward in contact with the filament when the filament is present, And a pivot block for selectively positioning a flap between the photosensor and the filament.

At this time, when the filament is not present, the rotating member rotates by the weight of the rotating block, the rotating flap blocks the optical sensor and the filament, and the rotating block blocks the filament conveying path.

Preferably, the pivot block is provided with a pair of guide ribs facing each other so that the filaments do not deviate from the conveying path.

Alternatively, the pivot block is provided with a guide hole formed along the conveying path so that the filament does not depart from the conveying path.

The filament driving unit may include a driving motor provided in the filament output unit to generate a driving force to feed the filament in a forward or reverse direction; A driving roller which is provided in the filament output part and receives the driving force of the driving motor to feed the filament in a forward direction or a reverse direction; A feeding roller which is provided in the filament feeding part and receives the driving force of the driving motor to feed the filament in a forward direction or a reverse direction; And a transmission gear disposed between the driving motor and the driving roller and between the driving motor and the feeding roller to transmit the driving force of the driving motor to the driving roller and the feeding roller.

Preferably, the filament output portion includes a second sensor portion for sensing a filament at an end portion thereof. The filament driving portion is installed between the driving motor and the feeding roller, and selectively transmits the driving force of the driving motor to the feeding roller Wherein the clutch is in an on state until the second sensor portion senses the filament in the forward rotation of the drive motor to transmit the driving force of the driving motor to the conveying roller, The second sensor part is turned off after the filament is sensed, and the clutch is always on when the driving motor rotates reversely.

According to the present invention, it is possible to prevent the driving parts from being continuously driven when the filament is blown on the conveyance path or when the filament of the cartridge is exhausted, and the output failure in which the three-dimensional output is incompletely output can be prevented.

Further, according to the present invention, it is possible to accurately guide the entry path of the filament fed to the filament output section side.

1 is a plan view showing a filament detecting apparatus for a three-dimensional printer according to the present invention,
FIGS. 2A to 2C are a plan view showing an operation example of a filament detecting device for a three-dimensional printer according to the present invention,
FIG. 3A is a perspective view showing a filament detecting apparatus for a three-dimensional printer according to the present invention when no filament is present, FIG.
FIG. 3B is a perspective view showing an alternative example of the filament detecting device for a three-dimensional printer according to the present invention,
4A is a front view showing a rotation flap of the filament detecting device for a three-dimensional printer according to the present invention,
FIG. 4B is a side view showing the rotation flap of the filament detecting device for a three-dimensional printer according to the present invention. FIG.

Hereinafter, a preferred embodiment of a filament detecting device for a three-dimensional printer according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the technical scope of the present invention. Will be.

Referring to FIG. 1, a three-dimensional (3D) printer is a device that is incorporated in a main body (not shown) to output a three-dimensional printed material by a method of melting and laminating filaments of a thermoplastic plastic material (FDM method). Here, the three-dimensional printer includes a filament supply unit 100, a filament output unit 200, and a driving unit 300.

The filament supply unit 100 takes up a filament made of a thermoplastic plastic material in the form of a wire and supplies the filament wound to the filament output unit 200. The filament output unit 200 transfers, melts, and discharges the filament fed from the filament feeding unit 100, thereby outputting the three-dimensional printed matter. The driving unit 300 automatically feeds the filament from the filament supply unit 100 to the filament output unit 200 and automatically discharges the filament from the filament output unit 200 toward the filament supply unit 100. In other words, the driving unit 300 is arranged in the forward direction for the three-dimensional printing (the direction from the filament supply unit 100 toward the filament output unit 200) and the reverse direction for discharging the fixed filament (the filament supply unit 200 100) in a direction perpendicular to the longitudinal direction of the filament.

The filament detecting apparatus for a three-dimensional printer according to the present invention includes a sensor unit 400 provided at a tip of a filament output unit 200 and detecting the presence or absence of a filament P.

The sensor unit 400 includes a photosensor 410 for sensing the presence of filaments and a filament P for irradiating light to the filament side to selectively block light emitted from the photosensor 410 to the filament side And includes a tiltable member 420.

3A and 3B, a path through which the filament is fed is formed at the tip of the filament output part 200, and a pair of side walls 201 facing each other is provided in the path. The light sensor 410 includes a light emitting portion 411 and a light receiving portion 412, which are provided on the side wall 201 in a direction facing each other. The pivoting member 420 is rotatably installed at the distal end of the filament output portion 200 and is disposed outside the light emitting portion 411 and the light receiving portion 412 by the filament P, The light between the light receiving portions 412 is not blocked. Then, the optical sensor 410 is turned off, indicating that the filament exists on the conveying path (the path extending along the longitudinal direction of the filament output part 200 in FIG. 1 and the filament is fed) It can be judged.

Preferably, the pivoting member 420 includes a pivot shaft 421, a pivoting flap 422, and a pivot block 423. The rotary shaft 421 is rotatably installed on the filament conveying path in a direction perpendicular to the feeding path of the filament. That is, the rotary shaft 421 is installed across the pair of side walls 201 of the filament output portion 200. The rotation flap 422 extends radially outward from the rotation axis 421 and is selectively positioned between the photosensor 410 and the filament by contact with the filament. Here, the rotation flap 422 is positioned at the upper portion with the rotation axis 421 as a center. The rotation block 423 extends from the rotation axis 421 in the direction opposite to the rotation flap 422 along the radial direction. In other words, the pivot block 423 is positioned at the lower portion around the pivot 421. Further, the rotation block 423 is formed in a shape blocking the feeding path of the filament, and blocks the feeding path of the filament when no filament exists on the feeding path. When the filament is present on the conveyance path, the rotation block 423 is brought into contact with the filament and rotated upward. When the rotation block 423 is rotated upward, the rotation flap 422 is positioned outside the optical sensor 410 and the filament by the rotation of the rotation axis 421. [ That is, the rotation flap 422 is not positioned between the light emitting portion 411 and the light receiving portion 412 of the optical sensor 410. Accordingly, the optical sensor 410 is turned off, and the sensor unit 400 can detect that the filament exists on the transfer path.

On the other hand, when the filament is not present on the conveying path, the pivoting member 420 is rotated by the weight of the pivoting block 423 so that the pivoting block 423 is positioned below the pivoting shaft 421 And the rotation flap 422 is positioned above the rotation axis 421. [ Thus, when no filament is present at the tip of the filament output portion, the turning flap 422 is disposed between the optical sensor 410 and the filament P, that is, between the light emitting portion 411 and the light receiving portion 412 of the optical sensor 410, So that light between the light emitting portion 411 and the light receiving portion 412 is blocked, and the rotation block 423 blocks the filament conveying path. Then, the optical sensor 410 can be turned on to sense that no filament exists on the conveyance path (see Figs. 2B, 2C and 3A).

On the other hand, if the filament exists on the conveying path, the rotating block 423 contacts the filament P and rotates upward, and the rotating flap 422 also rotates upward by the rotation of the rotating shaft 421 . Therefore, the rotation flap 422 is located between the optical sensor 410 and the filament, that is, between the light emitting portion 411 and the light receiving portion 412 of the optical sensor 410, Lt; / RTI > Then, the photosensor 410 is turned off to sense the presence of the filament on the transport path (see Figs. 2a and 3b).

As described above, the filament detecting device of the three-dimensional printer according to the present invention senses the presence or absence of filaments supplied from the filament supply unit 100, that is, from the cartridge to the filament output unit 200, And whether or not it is exhausted. Accordingly, it is possible to prevent the driving parts of the driving unit 300 from being driven continuously when the filament is blown on the conveying path or when the filament of the cartridge is exhausted, and the output failure in which the three-dimensional output is incompletely output can be prevented.

3A, the pivot block 423 of the pivoting member 420 includes a pair of guide ribs 423a facing each other and formed in parallel with the side wall 201 of the filament output portion 200 Respectively. The guide ribs 423a serve to guide the filaments conveyed on the conveying path to enter the filament output part 200 along the conveying path without deviating to the outside of the conveying path.

Alternatively, as shown in Figs. 3B, 4A and 4B, the pivot block 423 of the pivoting member 420 may have a guide hole 423b formed along the conveying path. The guide hole 423b also functions to guide the filament into the filament output part 200 along the feeding path without leaving the feeding path.

Referring again to FIG. 1, the filament supply unit 100 includes a box-shaped case 110 and a filament winding bobbin 120 mounted inside the case 110. The case 110 has a filament outlet 111 through which a filament can be discharged, and has a cover (not shown) that can be opened and closed at the front side. The case 110 is detachably attached to the main body of the 3D printer 10. The bobbin 120 is configured to wind a filament between a pair of discs spaced from each other, and is rotatably mounted on a rotating shaft provided at the center of the case 110.

The filament output unit 200 includes an inlet 210 through which the filament fed from the filament supply unit 100 flows and a discharge port 220 through which the filament is discharged to the inlet 210 through the filament. Although not shown in the figure, a nozzle unit for heating and melting the filament discharged through the discharge port 220 and outputting the melted filament to an output bed (not shown) is provided at the end of the filament output unit 200.

The driving unit 300 includes a driving motor 310, a driving roller 320, a feeding roller 330, and transmission gears 341 to 345. The driving motor 310 is provided in the filament output unit 200 to generate a driving force so that the filament is fed in the forward or reverse direction. The driving roller 320 is provided on the filament output part 200 and precisely on the upstream side of the driving motor 310 (with respect to the filament feeding direction). The driving roller 320 receives the driving force of the driving motor 310, Or in the reverse direction. The feeding roller 330 is provided in the filament feeding part 100, that is, inside the case 110, and receives the driving force of the driving motor 310 to feed the filament in the forward or reverse direction. The transfer gear 341 is provided between the driving motor 310 and the driving roller 320 and transfers the driving force of the driving motor 310 to the driving roller 320. The transfer gears 342 to 345 are provided between the drive motor 310 and the transfer roller 330 to transfer the driving force of the drive motor 310 to the transfer roller 330. That is, the driving roller 320 and the feeding roller 330 can be simultaneously driven by one driving motor 310.

The driving roller 320 and the conveying roller 330 are moved in the forward direction (the direction in which the filament is fed from the filament feeding portion 100 to the filament output portion 200) of the driving motor 310 The filament wound on the bobbin 120 can be automatically transferred to the filament output section 200 side. The driving roller 320 and the feeding roller 330 are driven in the reverse direction so that the filament is wound on the bobbin 120 and the filament of the filament output portion 200 is fed to the filament feeding portion 100 Lt; / RTI > Therefore, the filament can be accurately transferred to the inlet 210 of the filament output portion, and the filament can be smoothly discharged when the filament is fixed.

The driving unit 300 is disposed between the driving motor 310 and the conveying roller 330 so that the driving force of the driving motor 310 is selectively transmitted between the conveying roller 342 and the conveying gear 343, (330). The clutch 350 may be a one-way clutch or an electromagnetic clutch that transmits power only in one direction by a mechanical shape. The filament output unit 200 includes a second sensor unit 230 for detecting a filament at a distal end thereof. That is, the second sensor unit 230 is located on the filament conveying path, passing the driving motor 310 and the driving roller 320, away from the sensor unit 400.

Here, the clutch 350 is controlled to be turned on until the second sensor unit 230 senses the filament at the time of driving the driving motor 310 in the forward direction. The driving force of the driving motor 310 is transmitted to the driving roller 320 and the conveying roller 330 to transfer the filament from the filament supplying part 100 toward the filament output part 200. After the second sensor unit 230 senses the filament, the clutch 350 is controlled to be turned off. Accordingly, the driving force of the driving motor 310 is transmitted to the driving roller 320 only.

On the other hand, when the driving motor 310 is driven in the reverse direction, the clutch 350 is always controlled to be in an on state. The driving force of the driving motor 310 is transmitted to both the driving roller 320 and the conveying roller 330 while the driving motor 310 is reversely driven.

By such operation control of the clutch 350, the filament can be output with relatively large force by simultaneously operating the driving roller 320 and the feeding roller 330 at the time of forward feeding of the filament, Only the driving roller 320 can be operated to smoothly output the filament. When the filament is discharged in the reverse direction, the driving roller 320 and the conveying roller 330 can be operated at the same time to draw the filament from the filament output portion 200 with a relatively large force.

The embodiments of the present invention described above are merely illustrative of the technical idea of the present invention, and the scope of protection of the present invention should be interpreted according to the claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It should be interpreted that it is included in the scope of right.

Claims (7)

A filament supply unit for winding a filament in a wire form and supplying the filament wound; A filament output unit for outputting a three-dimensional printed matter by transferring and melting and discharging filaments supplied from the filament cartridge; And a driving unit for supplying a filament from the filament supply unit to the filament output unit and discharging the filament from the filament output unit toward the filament supply unit,
And a sensor unit provided at a distal end of the filament output unit to detect the presence or absence of the filament,
An optical sensor having a light emitting portion and a light receiving portion provided in a direction facing each other with respect to the filament, the presence or absence of the filament; And
And a pivoting member rotatably provided at a distal end of the filament output section and rotating by the filament to selectively block light emitted from the optical sensor toward the filament side.
The method according to claim 1,
Wherein the tiltable member comprises:
A rotating shaft rotatably installed on the filament transport path in a direction perpendicular to the feeding path of the filament;
A rotation flap extending radially outwardly from the rotation axis, the rotation flap being selectively positioned between the optical sensor and the filament; And
Wherein the filament is provided with a plurality of filaments extending in a direction opposite to the turning flap along the radial direction from the rotating shaft and interrupting the feeding path of the filament when no filament is present, And a rotating block for selectively positioning the filament between the optical sensor and the filament.
3. The method of claim 2,
Wherein when the filament is not present, the tilting member is rotated by the own weight of the tilting block, the tilting flap blocks the optical sensor and the filament, and the tilting block blocks the filament conveying path. Filament detection device.
The method according to claim 2 or 3,
Wherein the pivot block includes a pair of guide ribs facing each other so that the filaments do not deviate from the conveying path.
The method according to claim 2 or 3,
Wherein the pivot block includes a guide hole formed along a conveying path so that the filament does not go out of the conveying path.
The method according to claim 1,
Wherein the filament-
A driving motor provided in the filament output part to generate a driving force so that the filament is fed in a forward or reverse direction;
A driving roller which is provided in the filament output part and receives the driving force of the driving motor to feed the filament in a forward direction or a reverse direction;
A feeding roller which is provided in the filament feeding part and receives the driving force of the driving motor to feed the filament in a forward direction or a reverse direction; And
And a transfer gear provided between the drive motor and the drive roller and between the drive motor and the transfer roller for transferring a driving force of the drive motor to the drive roller and the transfer roller. Filament detection device.
The method according to claim 6,
The filament output portion includes a second sensor portion for sensing a filament at an end portion thereof. The filament driving portion includes a clutch installed between the driving motor and the feeding roller for selectively transmitting a driving force of the driving motor to the feeding roller ,
The clutch is in an ON state until the second sensor portion senses the filament in the forward rotation of the drive motor to transmit the driving force of the driving motor to the conveying roller, The filament is turned off after the filament is detected, and the clutch is always on when the driving motor rotates backward.
KR1020160017654A 2016-02-16 2016-02-16 Apparatus for detecting filament of 3D printer KR20170096357A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190100480A (en) 2018-02-05 2019-08-29 주식회사 네오시즈 Filament supply detection system of 3D printer and 3D printer using it
WO2019174935A1 (en) * 2018-03-16 2019-09-19 International Business Machines Corporation Printer filament feed monitoring
US20220118711A1 (en) * 2020-10-20 2022-04-21 Seiko Epson Corporation Three-Dimensional Shaping Device And Method For Manufacturing Three-Dimensional Shaped Object

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190100480A (en) 2018-02-05 2019-08-29 주식회사 네오시즈 Filament supply detection system of 3D printer and 3D printer using it
WO2019174935A1 (en) * 2018-03-16 2019-09-19 International Business Machines Corporation Printer filament feed monitoring
US11192308B2 (en) 2018-03-16 2021-12-07 International Business Machines Corporation Printer filament feed monitoring
US20220118711A1 (en) * 2020-10-20 2022-04-21 Seiko Epson Corporation Three-Dimensional Shaping Device And Method For Manufacturing Three-Dimensional Shaped Object

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