KR20170046355A

KR20170046355A - 3D Printer

Info

Publication number: KR20170046355A
Application number: KR1020150146575A
Authority: KR
Inventors: 권현진; 김성희; 김원효
Original assignee: (주)케이랩스
Priority date: 2015-10-21
Filing date: 2015-10-21
Publication date: 2017-05-02

Abstract

According to the present invention, provided is a 3D printer which can be easily assembled by a user or a manufacturer. To facilitate an installation process of x, y axis timing belts, which is the most demanding process in processes of assembling a 3D printer, first and second long holes are provided to allow first and second tensioners and first and second tensioners to be installed. After the x, y axis timing belts are installed, the first and second tensioners are installed in the first and second long holes and positions of the first and second tensioners are adjusted to apply appropriate tension to the x, y axis timing belts. In addition, even when the 3D printer is assembled and used, the tension of the x, y axis timing belts can be adjusted without disassembling the x, y axis timing belts, thereby finely correcting the position of a printer head.

Description

3D Printer {3D Printer}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 3D printer, and more particularly, to an FDM-type 3D printer for producing a three-dimensional shape by laminating molten filaments.

3D printers have evolved in a variety of ways since the early 1980s, when 3D Systems, Inc., first introduced a way to make three-dimensional shapes by solidifying plastic liquids. Nylon and metal materials have also been used as output materials for 3D printers at the initial stage, which is limited to plastic materials, and they are used as equipment for producing customized medical equipment with higher precision.

3D printers are largely divided into FDM (Fused Deposition Modeling), SLA (Stereolithography Apparatus), SLS (Selective Laser Simultaneous) and DLP (Direct Light Processing) according to the method of producing stereoscopic output.

Among the various 3D printing methods, the SLA scheme developed in 1986 by 3DSystems Inc. and the FDM scheme developed in 1989 by Stratasys Co. are most commonly used, Its structure is simple and low in price, and it is widely used for education and personal use.

The FDM method is a method in which plastic filaments such as PLA (Poly Lactacid) or ABS (Acryontrie Butadiene Styrene) are melted and laminated in a printer head. More specifically, the molten plastic filaments are stacked in layers of 0.01 to 0.08 mm thinner than paper to form a three-dimensional shape.

Generally, an FDM-type 3D printer includes a printer head for melting and discharging an output material, a bed on which discharged output materials are accumulated, and a driving unit for moving the printer head and the bed.

In a three-dimensional Cartesian coordinate system, printing the output material by moving the printhead and bed along the x and y axes produces a two-dimensional output. Moving the printer head or bed in the z-axis in this state to print a new layer on top of the existing output produces a three-dimensional output with a height in the z-axis. It is the principle of printing of the above-mentioned FDM-type 3D printer that repeats the above-described operation to produce a desired three-dimensional shape.

The above-mentioned FDM-type 3D printer is a well-known technology in the past, and disclosed in Korean Patent Laid-Open No. 10-2009-0119904 entitled " Method of Generating 3D Objects Using Modified ABS Material "and Korean Patent Publication No. 10-2015-0089240 And "3D printer".

Typical FDM 3D printers connect the timing belt by pulling it tightly after the printer head, bed, and motor are installed. Therefore, the process of installing the timing belt is not easy. Further, there is a problem that the tension of the timing belt can not be precisely controlled.

Considering the fact that the FDM type printer is widely used for education and personal use in general, it is desirable to design the printer so that it can be easily assembled by the general public. Further, if the tension of the timing belt can be adjusted without disassembling the timing belt after the 3D printer is assembled, it is possible to correct the movement of the printer head by adjusting the tension of the timing belt, thereby improving the print quality.

Korean Patent Laid-Open No. 10-2009-0119904 entitled " Method of Generating 3D Objects Using Modified ABS Material " Korean Patent Publication No. 10-2015-0089240 "3D Printer"

The present invention proposes a 3D printer of FDM type that can be easily assembled by a user or a manufacturer. It is possible to easily apply a predetermined tension to the timing belt that moves the printer head and the bed through the present invention and to facilitate the installation and disassembly of the timing belt in the assembling and disassembling process of the 3D printer.

According to an aspect of the present invention, there is provided a portable terminal comprising: a lower frame provided with an inner space and provided with a first elongated hole; a left frame and a right frame coupled to left and right of the lower frame; A frame including an upper frame coupled to the upper frame; A bed provided at an upper portion of the lower frame so as to be movable in a y-axis direction and to provide a place where filaments are stacked on the upper portion; A y-axis motor provided in the lower frame; A y-axis timing belt connecting the y-axis motor and the bed to convert the rotational force of the y-axis motor into y-axis movement of the bed; Z-axis guide means provided between the left frame and the right frame; A z-axis motor provided in the lower frame; A z-axis screw having a lower end coupled to the z-axis motor for receiving rotation of the z-axis motor and rotating about the z-axis; A head mount provided movably in the z-axis direction along the z-axis guide means and equipped with a screw coupling to be coupled with the z-axis screw, and having a second elongated hole; A printer head including a hot nozzle for melting the filament and discharging the filament to the bed, the printer head being coupled to the head mount so as to be movable in the x-axis direction; An extruder for feeding the filament to the printer head; An x-axis motor provided on the head mount; An x-axis timing belt connecting the x-axis motor and the printer head to switch rotation of the x-axis motor to x-axis movement of the printer head; A first tensioner mounted movably along the first long hole to apply an adjustable tension to the y-axis timing belt; A second tensioner mounted movably along the second long hole to apply an adjustable tension to the x-axis timing belt; .

According to the present invention, there is provided a 3D printer which can be easily assembled by a user or a manufacturer. It is possible to easily apply a predetermined tension to the timing belt for moving the printer head and the bed due to the present invention. In particular, the installation and disassembly of the timing belt can be facilitated during assembly and disassembly of the 3D printer.

1 is a perspective view of a 3D printer according to the present invention,
Fig. 2 is a front view of Fig. 1,
Fig. 3 is a rear view of Fig. 1,
Fig. 4 is a plan view of Fig. 1,
FIG. 5 is a perspective view of the lower frame and the bed of FIG. 1,
Fig. 6 is a perspective view of the head mount portion of Fig. 1,
Fig. 7 is an exploded perspective view of the printer head portion of Fig. 1,
8 is a conceptual view showing the position of the first tensioner when the y-axis timing belt is installed,
9 is a conceptual view showing the movement of the first tensioner after the installation of the y-axis timing belt,
10 is a conceptual view showing the position of the second tensioner when the x-axis timing belt is installed,
11 is a conceptual view showing the movement of the second tensioner after the installation of the x-axis timing belt.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification. Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise.

Fig. 1 is a perspective view of the 3D printer according to the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a rear view of Fig. 1, Fig. 4 is a plan view of Fig. Fig. 6 is a perspective view of the head mount portion of Fig. 1, Fig. 7 is an exploded perspective view of the printer head portion of Fig. 1, and Fig. 8 is a perspective view of the position of the first tensioner when the y- 9 is a conceptual diagram showing the movement of the first tensioner after the installation of the y-axis timing belt, FIG. 10 is a conceptual view showing the position of the second tensioner when the x-axis timing belt is installed, And a movement of the second tensioner after the installation.

The 3D printer of the present embodiment includes a frame 100, a bed 200, a printer head 300, a head mount 400, x, y, z-axis motors 500, 600 and 700, x and y axis timing belts 520 and 620, z The first and second elongated holes 115 and 480 are provided with the first and second tensioners 115 and 480 and the axial screws 710, Axis timing belts 520 and 620 can be easily adjusted and the tension of the x and y axis timing belts 520 and 620 can be easily adjusted after the x and y axis timing belts 520 and 620 are installed do. In addition, a slot for connecting an external storage device, an LCD panel for displaying information, and an LCD module (not shown) provided with an operation dial can be connected to the control board 900, You can check the status of the job and operate the 3D printer without connecting it directly.

The frame 100 includes a lower frame 110 for providing an internal space for installing a control board 900, a y-axis motor 600 and a z-axis motor 700, a ventilation hole formed at a lower portion thereof, A left frame 120 and a right frame 130 each of which is fixed to the right and left sides of the left and right sides of the main body 110 and provide a work space in which the printer head 300 and the bed 200 can move, And an upper frame 140 connecting upper ends of the left and right frames 130 and 120 with each other and having a handle 141 on the upper surface thereof.

A control board 900 is installed at the center of the inner space of the lower frame 110 and a z axis motor 700 is disposed on the left side of the control board 900 and a y axis motor 600 is provided on the right side of the control board 900. The z-axis motor and the y-axis motor adopt a stepping motor whose rotation is precisely controlled by a pulse signal. The z-axis motor 700 is installed such that the rotary shaft penetrates the upper surface of the lower frame 110 and protrudes to the outside of the lower frame 110. A z-axis screw 710 having a male thread formed on the protruded rotary shaft is extended do. The z-axis screw 710 receives the rotational force of the z-axis motor 700 and rotates about its axis. In addition, the y-axis motor 600 is installed such that the rotary shaft extends through the upper surface of the lower frame 110 to the outside of the lower frame 110, and the y-axis motor pulley 610 is installed on the rotary shaft. The y-axis motor pulley 610 receives the rotational force of the y-axis motor 600 and rotates about its axis.

5, a y-axis LM guide 111 is provided in the front-rear direction of the lower frame 110 at the center of the upper surface of the lower frame 110, and is spaced apart from the right side of the front portion and the rear portion of the y- The first-first-belt pulley 112 and the first-second-belt pulley 113 are provided. A y-axis limit switch 116 is provided on the upper side of the upper surface of the lower frame 110 and spaced apart from the left side of the y-axis LM guide 111. The y-axis limit switch 116 serves to prevent the bed 200 from infinitely moving in the + y-axis direction. The y-axis limit switch 116 is in contact with the y-axis guide block 210, which will be described later, provided on the lower surface of the bed 200, so that the y-axis limit switch 116 operates.

A rectangular shaped bed 200 capable of moving in the y axis direction is provided in a work space provided between the left frame 120 and the right frame 130 to provide a place where molten filaments are discharged from the printer head 300 and accumulated do. A y-axis guide block 210 coupled to the y-axis LM guide 111 is provided on the lower surface of the bed 200. The first and second belt-engaging screws 220 and 230 are provided on the lower surface of the bed 200 to the right of the y-axis guide block 210 in the front-rear direction. The y-axis guide block 210 is coupled to the y-axis LM guide 111 so that the bed 200 can move along the y-axis LM guide 111 in the y-axis direction.

A first elongated hole 114 is formed in the width direction of the lower frame 110 in the middle of the first-second belt pulley 113 and the y-axis motor pulley 610 on the upper surface of the lower frame 110. The first long hole 114 is a place where the first tensioner 115 is installed to be movable along the first long hole 114.

The first tensioner 115 is a cylindrical pulley having flanges formed by the width of the y-axis timing belt 620 on the upper and lower sides of the outer circumferential surface. The inner pulley has a bearing (not shown) The pulley coupled to the outer diameter of the bearing can rotate axially.

The first tensioner 115 is positioned above the first long hole 114 and the inner diameter of the bearing is screwed into the first long hole 114. The position of the first tensioner 115 can be adjusted by loosening the screw for fixing the first tensioner 115 to the first long hole 114 and the first tensioner 115 can be screwed into the first long hole 114 ) To be rotatable about an axis.

The y-axis timing belt 620 is a belt made of polyurethane or rubber which is formed with projections accommodated in grooves formed on the outer circumferential surface of the y-axis motor pulley 610 and has a smooth outer surface.

the first tensioner 115 is brought into close contact with the right semicircle of the first long hole 114 as shown in FIG. 8 in order to facilitate the installation of the y-axis timing belt 620. One end of the y-axis timing belt 620 is connected to the 1-1 belt connecting screw 220. The inner side of the y-axis timing belt 620 on which the projections are formed is installed so as to sequentially touch the outer peripheral surfaces of the 1-1 belt pulley 112, the y-axis motor pulley 610 and the 1-2 belt pulley 113 do. Then, the other end of the y-axis timing belt 620 is connected to the first-second belt engaging screw 230.

Since the y-axis timing belt 620 does not need to be pulled tightly, it can be easily installed. When the y-axis timing belt 620 is installed as described above, the first tensioner 115 is positioned outside the ring formed by the y-axis timing belt 620. After the y-axis timing belt 620 is installed, the first tensioner 115 located outside the y-axis timing belt 620 is moved to the left along the first long hole 114 as shown in Fig. the position of the first tensioner 115 is adjusted so that an appropriate tension is applied to the y-axis timing belt 620 and the first tensioner 115 is moved to the first long hole 114 so that the first tensioner 115 is no longer moved along the first long hole 114. [ And is fixed to the hole 114.

If the first tensioner 115 and the first elongated hole 114 are not provided, the tension of the y-axis timing belt 620 is set such that one end and the other end of the y- Axis timing belt 620 that is coupled to the y-axis timing belt 620 that is coupled to the y-axis timing belt 620. In addition, it is not easy to fasten the tensioned y-axis timing belt 620 to the first-first and second belt-engaging screws 220 and 230. In other words, the first tensioner 115 installed in the first long hole 114 serves to facilitate installation of the y-axis timing belt 620 and to apply adjustable tension to the y-axis timing belt 620 .

Z-axis guide means 117 are provided on the right and left sides of the center of the lower frame 110, respectively. The z-axis guiding means may be an LM guide rail, a cylindrical guide bar, or a slot-shaped guide groove. In this embodiment, a cylindrical z-axis guide bar 117 is employed. The z-axis guide bar 117 is a cylindrical bar for guiding the head mount 400 to move in the z-axis direction. The lower end of the z-axis guide bar 117 is fixed to the upper surface of the lower frame 110 And the upper end portion is fixed to the lower surface of the upper frame 140 to be parallel to the z-axis screw 710.

The printer head 300 is a hollow tube having a heater mounted at its lower portion and a hot nozzle 310 for melting and discharging filaments and a nozzle plate 310 disposed at an upper portion of the hot nozzle 310 to prevent the heat of the hot nozzle 310 from being transmitted to the upper portion. A heat sink 320, and a material inlet 311 formed in a hollow tube extending to the top of the heat sink. A cooling fan 330 for increasing the efficiency of the heat sink 320 is attached to the heat sink 320. A head cover 340 having a shape of a rectangular parallelepiped having a back surface and a part of the upper and lower surfaces opened is connected to the hot nozzle 310, And a heat sink 320 attached to the heat sink 320.

A head mount 350 for mounting the print head 300 on the head mount 400 is provided. The X-axis guide block 351 is coupled to the x-axis LM guide 410 to be described later. The x-axis guide block 351 is provided on the lower surface of the one end of the x- Second and first and second belt engaging screws 352 and 353 are provided in the left and right sides. A head coupling hole 354 through which the printer head 300 can be coupled is provided at the other end of the head mounting base 350 and the upper portion of the printer head 300 is coupled with the head coupling hole 354 so that the hot nozzle 310 faces downward. Hole 354 in the first embodiment.

The head mount 400 is a plate formed in an 'H' shape. An x-axis LM guide 410 for guiding the printer head 300 to move in the x-axis direction is provided in the center of the upper surface of the head mount 400 in the x-axis direction. A hole hole through which the z-axis guide bar 117 can pass is formed in the left center and the right center of the head mount 400, and the LM bushing 430 is coupled to the hole. The z-axis guide bar 117 is passed through the LM bushing 430 so that the head mount 400 is guided along the z-axis guide bar 117 to mount the head mount 400 on the z-axis guide bar 117 .

On the left front of the head mount 400, a screw coupling 440 having a female screw thread corresponding to a male screw thread of the z-axis screw 710 is provided. z-axis screw 710 to penetrate the screw coupling 440. When the z-axis screw 710 rotates by receiving the rotational force of the z-axis motor 700, the screw coupling 440 through which the z-axis screw 710 passes is moved up and down. Accordingly, the head mount 400 to which the screw coupling 440 is fixed is guided by the z-axis guide bar 117, and is moved in the z-axis direction while maintaining the horizontal state.

On the left side of the screw coupling 440, a switch contact screw 450 protrudes downward so that the head mount 400 descends to operate a z-axis limit switch 121 to be described later. The z-axis limit switch 121 serves to prevent the head mount 400 from moving infinitely in the -z-axis direction. The z-axis limit switch 121 is installed to protrude forward from the inside of the left frame 120. The mounting height is near the upper surface of the bed 200 and the screw head of the switch contact screw 450 can be brought into contact with the contact portion of the z axis limit switch 121 when the head mount 400 descends and descends near the bed 200 a z-axis limit switch 121 is provided.

An x-axis limit switch 460 is provided on the upper right front side of the head mount 400, and the contact portion of the x-axis limit switch 460 touches the right side of the head cover 340 to operate. The x-axis limit switch 460 serves to prevent the printer head 300 mounted on the head mount 400 from moving infinitely in the + x-axis direction.

An x-axis motor 500 is provided on the left rear side of the head mount 400. The x-axis motor 500 adopts a stepping motor whose rotation is precisely controlled by a pulse signal like the y, z-axis motors 600 and 700. [ The x-axis motor 500 is installed such that the rotation axis of the x-axis motor 400 penetrates the head mount 400 from below to protrude from the top surface of the head mount 400. The x-axis motor pulley 510 is coupled to the rotation shaft of the x-axis motor 500.

A second belt pulley 420 is provided on the upper right rear side of the head mount 400 and a second long hole 470 is provided in the y axis direction away from the left side of the second belt pulley 420. The second long hole 470 is a place where the second tensioner 480 is installed to be movable along the second long hole 470.

The second tensioner 480 is a cylindrical pulley having flanges spaced by the width of the x-axis timing belt 520 on the upper and lower sides of the outer circumferential surface, and a bearing (not shown) is provided on the inner circumferential surface thereof, The pulley coupled to the outer diameter of the bearing can rotate axially.

The second tensioner 480 is positioned above the second long hole 470 and the inner diameter of the bearing and the second long hole 470 are screwed together. The position of the second tensioner 480 can be adjusted by loosening the screw securing the second tensioner 480 to the second long hole 470 and the second tensioner 480 can be screwed into the second long hole 470 ) To be rotatable about an axis.

The x-axis timing belt 520 is a belt made of polyurethane or rubber, the inner side of which is formed with projections accommodated in grooves formed on the outer peripheral surface of the x-axis motor pulley 510 and the outer side is a smooth surface.

The X-axis guide block 351 is coupled to the x-axis LM guide 410 so that the printer head 300 can move in the x-axis direction. The second tensioner 480 is moved to the rear of the second long hole 470 as shown in FIG. 10 in order to facilitate installation of the x-axis timing belt 520. and one end of the x-axis timing belt 520 is connected to the second-1 belt coupling screw 352. The inner side of the x-axis timing belt 520 on which the projections are formed comes in contact with the outer peripheral surfaces of the x-axis motor pulley 510, the second belt pulley 420, and the second-second belt pulley 353 in order. Then, the other end of the y-axis timing belt 520 is connected to the second-second belt engagement screw 353.

Since the x-axis timing belt 520 does not need to be pulled tightly, it can be easily installed. the second tensioner 480 is disposed on the outer side of the x-axis timing belt 520 and the second tensioner 480 is moved forward along the second long hole 470 as shown in FIG. the position of the second tensioner 480 is adjusted so that a proper tension is applied to the x-axis timing belt 520 and the second tensioner 480 is moved to the second long hole 470 so that the second tensioner 480 is no longer moved along the second long hole 470. [ And fixed to the hole 470.

If the second tensioner 480 and the second elongated hole 470 are not provided, the tension of the x-axis timing belt 520 is transmitted to one end of the x-axis timing belt 520 and the other end of the x- Axis timing belt 520 that is coupled to the timing belt 352 and 353. Also, it is not easy to connect the tightly pulled x-axis timing belt 520 to the second-first and second belt-engaging screws 352 and 353. In other words, the second tensioner 480 installed in the second long hole 470 also facilitates the installation of the x-axis timing belt 520, like the first tensioner 115 installed in the first long hole 114, And serves to apply an adjustable tension to the shaft timing belt 520. [

An extruder 800 is provided on the outer side of the upper part of the right frame 130. The extruder 800 is a device that pushes the filament as an output material into the material inlet 311 of the printer head 300 and is coupled to the right frame 130 using the extruder mount 810. In addition, a Teflon tube 820 is used to connect the extruder 800 with the material inlet 311 of the printer head 300 in Bowden fashion. When the extruder 800 and the printer head 300 are connected to each other in a Bowden-type manner, the printer head 300 is lightened and the output speed is improved and the accuracy of the x-axis movement of the printer head 300 is increased. The description of the method of connecting the printer head 300 to the extruder 800 is well known in the prior art related to the 3D printer, and thus a detailed description thereof will be omitted.

After the components are installed in the predetermined positions as described above, wiring connection (not shown) is performed to operate the respective components. The x, y, and z axis motors 500, 600, and 700 and the extruder 800 are connected to the control board 900 so as to receive pulse signals necessary for operating the 3D printer. The control board 900 is connected to the control board 900 such that the contact signals of the x, y and z axis limit switches 460, 116 and 121 are transmitted to the control board 900 and the power is supplied to the hot nozzle 310. A power button 118a on the back of the lower frame 110 and a power socket 118b for inputting an external power source to the control board 900 and a main fan 118a for actively discharging the heat inside the lower frame 110. [ 118c are also provided and are also connected to the control board 900. [

The 3D printer of the present embodiment can be easily assembled according to the above-described procedure. In particular, due to the role of the first and second tensioners 115 and 480 and the first and second long holes 114 and 470, the x and y axis timing belts 520 and 620 ) Is very easy to install.

In the conventional 3D printer, a tensioner is not installed separately, and the timing belt must be pulled by hand. Therefore, the tension of the timing belt is determined by the pulling force of the person during the installation, and it is not easy to install the timing belt so that a proper tension is applied to the timing belt. However, in the 3D printer of the present embodiment, the first and second tensioners 115 and 480 capable of adjusting the tension are provided, and as shown in FIGS. 8 to 11, the first and second tensioners 115, and 480 can be moved. Accordingly, it is not necessary to pull the x- and y-axis timing belts 520 and 620 by tension, and appropriate tension can be applied to the x- and y-axis timing belts 520 and 620. In addition, since the positions of the first and second tensioners 115 and 480 can be finely moved to adjust the strength of the tension, the print quality due to the difference in tension between the x- and y-axis timing belts 520 and 620 can be corrected.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be.

It is therefore to be understood that the embodiments described above are intended to be illustrative, but not limiting, in all respects. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than by the foregoing description and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

100: frame
110: lower frame 111: y-axis LM guide
112: Belt pulley 1-1: Belt pulley 113: Belt pulley 1-2
114: first long hole 115: first tensioner
116: y-axis limit switch 117: z-axis guide bar
118a: Power button 118b: Power socket
118c: Main fan
120: Left frame 121: Z-axis limit switch
130: right frame
140: upper frame 141: handle
200: bed 210: y-axis guide block
220: 1-1 belt connecting screw 230: 1-2 belt connecting screw
300: printer head 310: hot nozzle
311: Material inlet 320: Heat sink
330: cooling fan 340: head cover
350: Head mounting base 351: x-axis guide block
352: Belt 2-1 Belt coupling screw 353: Belt 2-2 Belt coupling screw
354: head coupling hole
400: head mount 410: x-axis LM guide
420: second belt pulley 430: LM bushing
440: screw coupling 450: switch contact screw
460: x-axis limit switch 470: second long hole
480: second tensioner
500: x-axis motor 510: x-axis motor pulley
520: x-axis timing belt
600: y-axis motor 610: y-axis motor pulley
620: Y-axis timing belt
700: z axis motor 710: z axis screw
800: extruder 810: extruder mounting base
820: Teflon tube 900: Control board

Claims

A frame including a lower frame provided with an inner space and provided with a first elongated hole, a left frame and a right frame coupled to the left and right of the lower frame, and an upper frame coupled to connect the left frame and the upper portion of the right frame;
A bed provided at the upper portion of the lower frame so as to be movable in the y axis direction and to provide a place where the filaments are stacked on the upper portion;
A y-axis motor provided in the lower frame;
A y-axis timing belt connecting the y-axis motor and the bed to convert the rotational force of the y-axis motor into y-axis movement of the bed;
Z-axis guide means provided between the left frame and the right frame;
A z-axis motor provided in the lower frame;
A z-axis screw having a lower end coupled to the z-axis motor for receiving rotation of the z-axis motor and rotating about the z-axis;
A head mount provided movably in the z-axis direction along the z-axis guide means and equipped with a screw coupling coupled with the z-axis screw, and having a second elongated hole;
A printer head including a hot nozzle for melting a filament and discharging the filament to the bed, the printer head being coupled to the head mount so as to be movable in an x-axis direction;
An extruder for feeding the filament to the printer head;
An x-axis motor provided on the head mount;
An x-axis timing belt connecting the x-axis motor and the printer head to switch the rotational force of the x-axis motor to x-axis movement of the printer head;
A first tensioner mounted movably along the first long hole to apply an adjustable tension to the y-axis timing belt;
A second tensioner mounted movably along the second long hole to apply an adjustable tension to the x-axis timing belt;
And a controller for controlling the printer.