3D printer for construction and method of operating the same

Abstract

A construction 3D printer and a method of operating the same are disclosed. The disclosed construction 3D printer includes an X-axis body horizontally arranged to extend in the X-axis direction, a Z-axis body coupled to the X-axis body so as to be able to move back and forth in the X-axis direction, and a Y-axis body coupled to the Z-axis body so as to be able to move up and down in the Z-axis direction.

Description

Technology Field

[0001] A 3D printer for construction and a method of operating the same are disclosed. More specifically, a 3D printer for construction capable of self-folding and self-moving and having excellent structural stability and a method of operating the same are disclosed. Background Technology

[0002] Generally, frame-type equipment is primarily used for printing large structures in construction 3D printers. However, for these conventional construction 3D printers, heavy equipment such as cranes must be used during the assembly and installation process. This results in problems where not only is it time-consuming to install the equipment, but the installation and dismantling processes are also cumbersome and complex.

[0003] In addition, conventional frame-type 3D printers can only print from a fixed position, so changing the printing position requires dismantling and reinstalling the equipment. This process also requires the use of heavy equipment and has limitations in that installation and dismantling take a long time. The problem to be solved

[0004] One embodiment of the present invention provides a construction 3D printer capable of self-folding and self-moving, and having excellent structural stability.

[0005] Another embodiment of the present invention provides a method for operating the construction 3D printer. means of solving the problem

[0006] One aspect of the present invention is,

[0007] X-axis body horizontally positioned to extend in the X-axis direction;

[0008] A Z-axis body coupled to the above X-axis body so as to be able to move back and forth in the X-axis direction; and

[0009] A construction 3D printer is provided that includes a Y-axis body coupled to the above Z-axis body so as to be able to move up and down in the Z-axis direction.

[0010] The above X-axis body includes a pair of X-axis rails extended in the X-axis direction, and the Z-axis body may be configured to move back and forth in the X-axis direction along the pair of X-axis rails.

[0011] The above construction 3D printer may further include an X-axis actuator configured to move the Z-axis body back and forth in the X-axis direction along the pair of X-axis rails.

[0012] The above construction 3D printer may further include a plurality of drive wheels configured to be coupled to the X-axis body and to move the X-axis body.

[0013] The above construction 3D printer may further include a brace coupled to the X-axis body.

[0014] The above construction 3D printer may further include a mixer car coupled to the X-axis body via the brace.

[0015] The Z-axis body can be rotatably coupled to the X-axis body and configured to be erected vertically or laid horizontally on the X-axis body.

[0016] The above construction 3D printer may further include a first Z-axis actuator configured to position the Z-axis body vertically relative to the X-axis body or to lay it horizontally on top of the X-axis body.

[0017] The above Z-axis body includes two pairs of Z-axis rails extended in the Z-axis direction, and the Y-axis body may be configured to move up and down in the Z-axis direction along the two pairs of Z-axis rails.

[0018] The above construction 3D printer may further include a second Z-axis actuator configured to raise and lower the Y-axis body in the Z-axis direction along the two pairs of Z-axis rails.

[0019] The above Y-axis body may include a first Y-axis body coupled to the second Z-axis actuator and a second Y-axis body configured to be able to move back and forth in the Y-axis direction to the first Y-axis body.

[0020] The first Y-axis body includes an LM guide rail, and the second Y-axis body may include an LM guide block.

[0021] The first Y-axis body of the above Y-axis body is hinge-coupled to the second Z-axis actuator, and the construction 3D printer may further include a Y-axis actuator configured to rotate the Y-axis body in one direction to intersect perpendicularly with the Z-axis body, or to rotate the Y-axis body in the opposite direction to be seated parallel to the Z-axis body.

[0022] The above Y-axis actuator may include a cylinder tube coupled to the second Z-axis actuator and a piston rod coupled to the first Y-axis body and configured to slide within the cylinder tube.

[0023] The above construction 3D printer may further include a printer head coupled to the second Y-axis body.

[0024] Another aspect of the present invention is,

[0025] A method of operating a construction 3D printer comprising an X-axis body, a Z-axis body, a Y-axis body, and a mixer car, wherein

[0026] Step (S10) in which, with the Z-axis body and the Y-axis body lying horizontally on the X-axis body, the Y-axis body is rotated counterclockwise to intersect perpendicularly with the Z-axis body;

[0027] Step (S20) of rotating the Z-axis body counterclockwise to position it vertically with respect to the X-axis body; and

[0028] A method for operating a construction 3D printer is provided, comprising the step (S30) of moving the Z-axis body forward and backward in the X-axis direction, moving the Y-axis body up and down in the Z-axis direction relative to the Z-axis body, moving a part of the Y-axis body forward and backward in the Y-axis direction to move a printer head coupled to the Y-axis body forward and backward in the Y-axis direction, or performing a combination of these operations while discharging a construction material through the printer head.

[0029] The method of operating the above construction 3D printer may further include the step (S1) of connecting the mixer car to the X-axis body prior to the above step (S30).

[0030] The method of operating the above construction 3D printer may further include a step (S2) of moving the construction 3D printer before or after the above step (S30).

[0031] The method of operating the above construction 3D printer may further include the step of retracting the Z-axis body as far as possible in the X-axis direction (S40), the step of rotating the Z-axis body clockwise to lay it horizontally on the X-axis body (S50), and the step of rotating the Y-axis body clockwise to place it parallel on the Z-axis body (S60).

[0032] The method of operating the above construction 3D printer may further include the step (S3) of separating the mixer car from the X-axis body after the above step (S30). Effects of the invention

[0033] A construction 3D printer according to one embodiment of the present invention has the effect of reducing installation and dismantling time by about 90% compared to a conventional frame-type 3D printer, eliminating the need for heavy equipment during the installation and dismantling process, and ensuring structural stability by utilizing a control device. Brief explanation of the drawing

[0034] FIGS. 1a to 1c are perspective views showing a 3D printer for construction according to one embodiment of the present invention from different angles. FIG. 2a is a drawing showing a state in which both the Z-axis body and the Y-axis body are folded in a 3D printer for construction according to one embodiment of the present invention. FIG. 2b is a drawing illustrating a state in which the Z-axis body is folded and the Y-axis body is unfolded in a 3D printer for construction according to one embodiment of the present invention. FIG. 2c is a drawing showing the state in which both the Z-axis body and the Y-axis body are unfolded in a 3D printer for construction according to one embodiment of the present invention. Specific details for implementing the invention

[0035] Hereinafter, a construction 3D printer according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0036] FIGS. 1a to 1c are perspective views showing a 3D printer (100) for construction according to one embodiment of the present invention at different angles.

[0037] Referring to FIGS. 1a to 1c, a construction 3D printer (100) according to one embodiment of the present invention includes an X-axis body (110), a Z-axis body (120), and a Y-axis body (130).

[0038] The X-axis body (110) can be arranged horizontally so as to extend in the X-axis direction.

[0039] Additionally, the X-axis body (110) may include a pair of X-axis rails (XR) extended in the X-axis direction.

[0040] The X-axis rail (XR) is a component for guiding the movement of the Z-axis body (120) in the X-axis direction. Unlike a general LM guide, it can be formed as a railway rail structure to reduce the risk of malfunction caused by foreign substances such as sand and dust that may occur in the external environment. Therefore, the X-axis rail (XR) enables smooth movement of the Z-axis body (120) while ensuring durability and stability even in a rough construction site environment.

[0041] Additionally, the construction 3D printer (100) may further include a plurality of drive wheels (FW, RW). Specifically, the construction 3D printer (100) includes a pair of front drive wheels (FW) and a pair of rear drive wheels (RW), and these drive wheels (FW, RW) may be mounted on an X-axis body (110) and configured to move the X-axis body (110).

[0042] In addition, multiple drive wheels (FW, RW) are rotated by a hydraulic motor driven by battery power, and electrical energy is converted into hydraulic power and transmitted to the drive wheels. Therefore, the multiple drive wheels (FW, RW) can move the X-axis body (110) stably and smoothly even in a rough environment such as a construction site.

[0043] Additionally, the construction 3D printer (100) may further include a brace (160).

[0044] One end of the brace (160) is connected to the X-axis body (110) and the other end is connected to the mixer car (170) described later, and serves to connect the X-axis body (110) of the construction 3D printer (100) and the mixer car (170). Specifically, when installing the construction 3D printer (100), the brace (160) is connected to the mixer car (170) to prevent the construction 3D printer (100) from tipping over and can be configured to improve the stability of the entire structure by securing a moment arm.

[0045] More specifically, the brace (160) may include a first brace (161) and a second brace (162) joined to form a V-shape at different locations on the X-axis body (110), and a third brace (163) joined to the connection portion of the first brace (161) and the second brace (162). Additionally, the first brace (161), the second brace (162), and the third brace (163) may be formed integrally.

[0046] The Z-axis body (120) can be coupled to the X-axis body (110) so as to be able to move back and forth in the X-axis direction. Specifically, the Z-axis body (120) can be configured to move back and forth in the X-axis direction along a pair of X-axis rails (XR).

[0047] Additionally, the construction 3D printer (100) may further include an X-axis actuator (XA).

[0048] The X-axis actuator (XA) may be configured to move the Z-axis body (120) back and forth in the X-axis direction along a pair of X-axis rails (XR). For example, the X-axis actuator (XA) may be configured such that a fixed end (not shown) is coupled to the Z-axis body (120), and a first power transmission member (not shown) engages with a pair of X-axis rails (XR) installed on the X-axis body (110). The first power transmission member may include a ball screw and a ball screw nut, a lead screw and a lead screw nut, a belt and a belt pulley or a belt fixing plate, or a combination thereof, and may be operated to achieve linear movement by a hydraulic cylinder or an electric motor. At this time, depending on the operation of the X-axis actuator (XA), the Z-axis body (120) moves back and forth in the X-axis direction along the X-axis rail (XR), and the Y-axis body (130) and printer head (150) coupled to the Z-axis body (120) also move together. Therefore, when the X-axis actuator (XA) is operated while coupled to the Z-axis body (120), the movement in the X-axis direction can simultaneously move the entire Z-axis body (120) and the components coupled to the Z-axis body (120).

[0049] Additionally, the construction 3D printer (100) may further include a plurality of supports (not shown). The plurality of supports are respectively installed on the bottom surface of one end of the X-axis body (110), the bottom surface of the other end of the X-axis body (110), and the bottom surface of the connection between the brace (160) and the mixer car (170) to support the X-axis body (110) and to serve as a fixed axis when the equipment (i.e., the construction 3D printer (100)) is moved and installed on-site. Each support consists of a total of three points, and the plane connecting these three points forms an output plane that serves as a reference for material layering during the printing operation. The height and parallelism of the output plane directly affect the quality of the first layer of the equipment and the precision of the overall structure. Additionally, the supports installed at two points on the X-axis body (110) can be hydraulically adjusted in height, so they can be configured to maintain the parallelism and positional accuracy of the output plane even after the equipment is installed. This prevents material from being deposited in areas lower than the output plane, thereby ensuring stable overall deposition quality.

[0050] Additionally, the construction 3D printer (100) may further include a mixer car (170).

[0051] The mixer car (170) mixes raw materials to produce mortar and supplies the produced mortar to the printer head (150).

[0052] The mixer car (170) can be connected to the X-axis body (110) via a brace (160).

[0053] The Z-axis body (120) can be coupled to the X-axis body (110) so as to be able to move back and forth in the X-axis direction.

[0054] Additionally, the Z-axis body (120) can be rotatably coupled to the X-axis body (110) and configured to be erected vertically or laid horizontally on the X-axis body (110).

[0055] Additionally, the construction 3D printer (100) may further include a first Z-axis actuator (ZA1).

[0056] The first Z-axis actuator (ZA1) may be configured to position the Z-axis body (120) vertically relative to the X-axis body (110) or to lay it horizontally on the X-axis body (110). Specifically, the first Z-axis actuator (ZA1) may be a cylinder type comprising a first cylinder tube (not shown) and a first piston rod (not shown), and the cylinder type may be implemented in a hydraulic, pneumatic, or electric manner.

[0057] Additionally, the Z-axis body (120) may include two pairs of Z-axis rails (ZR) extended in the Z-axis direction.

[0058] Two pairs of Z-axis rails (ZR) are each placed on opposite sides of the Z-axis body (120), and a pair of Z-axis rails (ZR) can be installed side by side on each side.

[0059] Two pairs of Z-axis rails (ZR) are members for guiding the movement of the Y-axis body (130) in the Z-axis direction. Unlike general LM guides, they can be formed with a railway rail structure to reduce the risk of malfunction caused by foreign substances such as sand and dust that may occur in the external environment. Accordingly, the two pairs of Z-axis rails (ZR) enable smooth movement of the Y-axis body (130) while ensuring durability and stability even in a rough construction site environment.

[0060] The Y-axis body (130) can be coupled to the Z-axis body (120) so as to be able to move up and down in the Z-axis direction.

[0061] Specifically, the Y-axis body (130) can be configured to move up and down in the Z-axis direction along two pairs of Z-axis rails (ZR).

[0062] Additionally, the construction 3D printer (100) may further include a second Z-axis actuator (ZA2).

[0063] The second Z-axis actuator (ZA2) may be configured to raise and lower the Y-axis body (130) in the Z-axis direction along two pairs of Z-axis rails (ZR). For example, the second Z-axis actuator (ZA2) may be configured so that a second power transmission member (not shown) engages with two pairs of Z-axis rails (ZR) installed on the Y-axis body (130). The second power transmission member may include a ball screw and a ball screw nut, a lead screw and a lead screw nut, a belt and a belt pulley or a belt fixing plate, or a combination thereof, and may be operated to achieve linear movement by a hydraulic cylinder, a pneumatic cylinder, or an electric motor. At this time, the second Z-axis actuator (ZA2) is controlled to prevent free fall that may occur due to its own weight and the weight of the Y-axis body (130), and may be configured so that raising and lowering occurs only by the driving force of the actuator. Accordingly, in accordance with the operation of the second Z-axis actuator (ZA2), the Y-axis body (130) moves up and down stably in the Z-axis direction along two pairs of Z-axis rails (ZR), and the printer head (150) coupled to the Y-axis body (130) also moves up and down together. Accordingly, the second Z-axis actuator (ZA2) performs the role of precisely moving the Y-axis body (130) and the printer head (150) coupled thereto in the Z-axis direction without falling.

[0064] Additionally, the Y-axis body (130) may include a first Y-axis body (131) and a second Y-axis body (132).

[0065] The first Y-axis body (131) can be coupled to the second Z-axis actuator (ZA2) and configured to move up and down in the Z-axis direction together with the second Z-axis actuator (ZA2).

[0066] The second Y-axis body (132) can be configured to move back and forth in the Y-axis direction relative to the first Y-axis body (131), thereby allowing the position of the printer head (150) to be precisely adjusted.

[0067] The first Y-axis body (131) includes an LM guide rail (not shown), and the second Y-axis body (132) may include an LM guide block (not shown). The second Y-axis body (132) is stably slidably coupled to the first Y-axis body (131) through the LM guide rail and the LM guide block, and this sliding coupling structure enables precise position control and vibration minimization when the second Y-axis body (132) moves back and forth in the Y-axis direction. Through this, the printer head (150) can be stably moved even during long-distance printing.

[0068] Additionally, the first Y-axis body (131) of the Y-axis body (130) can be hinge-coupled to the second Z-axis actuator (ZA2), thereby allowing the entire Y-axis body (130) to be supported so as to be rotatable around the second Z-axis actuator (ZA2).

[0069] Additionally, the construction 3D printer (100) may further include a Y-axis actuator (YA).

[0070] The Y-axis actuator (YA) can be configured to rotate the Y-axis body (130) in one direction to intersect it perpendicularly with the Z-axis body (120), or to rotate the Y-axis body (130) in the opposite direction to be seated parallel to the Z-axis body (120). Through this, the relative positions of the Y-axis body (130) and the Z-axis body (120) can be changed as needed, and the installation, transportation, and space utilization of the equipment can be efficiently secured during 3D printing operations.

[0071] Specifically, the Y-axis actuator (YA) may be a cylinder type comprising a coupling member (YA1), a second cylinder tube (YA2), and a second piston rod (YA3), and the cylinder type may be implemented in a hydraulic, pneumatic, or electric manner.

[0072] The coupling member (YA1) can be coupled to the second Z-axis actuator (ZA2) and configured to be able to move up and down along the Z-axis body (120) together with the second Z-axis actuator (ZA2).

[0073] The second cylinder tube (YA2) is coupled to and fixed to the coupling member (YA1), and one end of the second piston rod (YA3) is coupled to and fixed to the first Y-axis body (131), while the other end can be configured to slide linearly within the fixed second cylinder tube (YA2). Through this, when the Y-axis actuator (YA) is operated, the second piston rod (YA3) slides and can rotate the first Y-axis body (131). As a result, the entire Y-axis body (130) can be stably rotated to fold or unfold. This configuration contributes to efficiently securing equipment installation, transportation, and space utilization during 3D printing.

[0074] Additionally, the construction 3D printer (100) may further include a weight (140) to prevent sagging caused by the moment generated in the cantilever structure. The weight of the weight (140) may be configured to be adjustable, thereby ensuring the stability of the construction 3D printer (100) and stably maintaining the horizontal state of the upper structure including the printer head (150).

[0075] Additionally, the construction 3D printer (100) may further include a printer head (150).

[0076] The printer head (150) can be coupled to the second Y-axis body (132).

[0077] Additionally, the printer head (150) is a device for supplying and discharging 3D printing material, and may include a hopper (151) for temporarily storing material and a nozzle (152) for precisely discharging material.

[0078] The hopper (151) can be configured to stably supply 3D printing materials such as mortar, and the nozzle (152) can be configured to precisely discharge the material supplied from the hopper (151) at a desired shape and speed.

[0079] A motor screw (not shown) and a laser distance sensor (not shown) may be provided inside the hopper (151). The motor screw can be controlled to discharge an appropriate amount of material, and the laser distance sensor can detect the amount of material remaining in the hopper (151) and control the material supply pump to be automatically turned on / off. Through this, the hopper (151) stably supplies 3D printing material such as mortar, and the nozzle (152) can precisely discharge the material supplied from the hopper (151) at a desired shape and speed.

[0080] Additionally, the construction 3D printer (100) may further include a hose (not shown) and a cable (not shown). The hose acts as a passage for stably transporting printing material (raw material or mortar) from the mixer car (140) to the printer head (150), and the cable may be configured to supply power lines and communication lines to each component. Furthermore, the hose and cable may be designed to be placed inside the track so as to operate stably without twisting or interference even when driving along the X-axis, Y-axis, and Z-axis.

[0081] Hereinafter, a method of operating a construction 3D printer according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0082] FIG. 2a is a drawing showing a state in which both the Z-axis body (120) and the Y-axis body (130) are folded in a 3D printer (100) for construction according to one embodiment of the present invention, FIG. 2b is a drawing showing a state in which the Z-axis body (120) is folded and the Y-axis body (130) is unfolded in a 3D printer (100) for construction according to one embodiment of the present invention, and FIG. 2c is a drawing showing a state in which both the Z-axis body (120) and the Y-axis body (130) are unfolded in a 3D printer (100) for construction according to one embodiment of the present invention.

[0083] Referring to FIG. 2a, a construction 3D printer (100) comprising an X-axis body (110), a Z-axis body (120), a Y-axis body (130), and a mixer car (170) exists with the Z-axis body (120) and the Y-axis body (130) positioned horizontally on the X-axis body (110). With this configuration, the construction 3D printer (100) can move on general roads or at construction sites without interference with surrounding vehicles or obstacles, and can be efficiently stored even in confined spaces.

[0084] Referring to FIG. 2a and FIG. 2b, a method of operating a construction 3D printer according to one embodiment of the present invention may include a step (S10) in which, while the Z-axis body (120) and the Y-axis body (130) are lying horizontally on the X-axis body (110), the Y-axis body (130) is rotated counterclockwise by driving a Y-axis actuator (YA) to be positioned perpendicularly to the Z-axis body (120). At this time, the Y-axis actuator (YA) is configured to rotate the Y-axis body (130) in one direction, thereby stably changing the posture of the Y-axis body (130) to realize a working posture orthogonal to the Z-axis body (120).

[0085] Referring to FIGS. 2b and 2c, the method of operating the construction 3D printer may further include a step (S20) of rotating the Z-axis body (120) counterclockwise by driving the first Z-axis actuator (ZA1) while the Y-axis body (130) is positioned perpendicularly to the Z-axis body (120) to set it perpendicularly to the X-axis body (110). At this time, the first Z-axis actuator (ZA1) controls the rotational drive of the Z-axis body (120), thereby maintaining structural stability when the construction 3D printer (100) is switched to a working position.

[0086] Additionally, the method of operating the above-described construction 3D printer may further include a step (S30) of discharging construction material through a printer head (150). At this time, the step (S30) may include, as a first operation, a process of moving the Z-axis body (120) forward and backward in the X-axis direction by driving the X-axis actuator (XA); as a second operation, a process of moving the Y-axis body (130) up and down in the Z-axis direction relative to the Z-axis body (120) by driving the second Z-axis actuator (ZA2); and as a third operation, a process of sliding the second Y-axis body (132) on the first Y-axis body (131) to move the printer head (150) coupled to the second Y-axis body (132) forward and backward in the Y-axis direction. The above operations may be performed individually or in combination, thereby allowing the printer head (150) to move precisely in the X-axis, Y-axis and / or Z-axis directions and form a desired three-dimensional structure by stacking construction materials along a set path.

[0087] Additionally, the method of operating the above-described construction 3D printer may further include a step (S1) of connecting a mixer car (170) to an X-axis body (110) prior to the above step (S30). Specifically, the above step (S1) may include a step (S1-1) of attaching a brace (160) to the X-axis body (110) and a step (S1-2) of attaching a mixer car (170) to the brace (160). Through this, a 3D printing material supply path to the printer head (150) can be secured.

[0088] Additionally, the method of operating the construction 3D printer may further include a step (S2) of moving the construction 3D printer (100) before or after the step (S30). In the step (S2), the entire construction 3D printer (100) can be moved to a general road, a construction site, or a confined space using a drive wheel (FW, RW) coupled to the X-axis body (110) and a related drive motor.

[0089] Additionally, the method of operating the above-described construction 3D printer may further include the step of retracting the Z-axis body (120) as far as possible in the X-axis direction (S40), the step of rotating the Z-axis body (120) clockwise to lay it horizontally on the X-axis body (110) (S50), and the step of rotating the Y-axis body (130) clockwise to place it parallel to the Z-axis body (120) (S60).

[0090] The above steps (S40, S50, S60) are preparation processes for converting the construction 3D printer (100) into a movable and storable state, and the height and width of the construction 3D printer (100) can be minimized by changing the position and / or rotating the Z-axis body (120) and the Y-axis body (130). At this time, a driving device including an X-axis actuator (XA), a first Z-axis actuator (ZA1), and a Y-axis actuator (YA) operates in conjunction so that the movement and / or rotation of each body (120, 130) can be performed precisely.

[0091] Additionally, the method of operating the construction 3D printer may further include a step (S3) of separating the mixer car (170) from the X-axis body (110) after the above step (S30). Specifically, the above step (S3) may include a step (S3-1) of separating the mixer car (170) from the brace (160) and a step (S3-2) of separating the brace (160) from the X-axis body (110). The above step (S3) is a process for safely separating the mixer car (170) from the X-axis body (110) after the 3D printing operation is completed, thereby returning the construction 3D printer (100) to a movable or storable state.

[0092] The present invention has been described with reference to the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. Explanation of the symbols

[0093] 100: Construction 3D printer 110: X-axis body 120: Z-axis body 130: Y-axis body 131: 1st Y-axis body 132: 2nd Y-axis body 140: Counterweight 150: Printer head 151, 172: Hopper 152: Nozzle 160: Brace 161: First Brace 162: 1st Brace 163: 3rd Brace 170: Mixer Car XR: X-axis Rail ZR: Z-axis rail XA: X-axis actuator YA: Y-axis actuator YA1: Connecting member YA2: Cylinder YA3: Piston rod ZA1, ZA2: Z-axis actuator FW: Front drive wheel RW: Rear drive wheel

Claims

Claim 1 A 3D printer for construction, wherein the 3D printer for construction comprises: an X-axis body horizontally arranged to extend in the X-axis direction; a Z-axis body coupled to the X-axis body so as to be able to move back and forth in the X-axis direction; a Y-axis body coupled to the Z-axis body so as to be able to move up and down in the Z-axis direction; a first Z-axis actuator configured to set the Z-axis body vertically relative to the X-axis body or lay it horizontally on top of the X-axis body; a second Z-axis actuator configured to raise and lower the Y-axis body in the Z-axis direction; and a brace coupled to the X-axis body. A construction 3D printer comprising: a mixer car coupled to the X-axis body via the brace; wherein the brace is connected to the mixer car to prevent tipping of the construction 3D printer and is configured to improve the stability of the entire structure by securing a moment arm; wherein the Z-axis body is rotatably coupled to the X-axis body and is configured to be erected vertically or laid horizontally on the X-axis body; wherein the Y-axis body includes a first Y-axis body coupled to the second Z-axis actuator and a second Y-axis body configured to be able to move back and forth in the Y-axis direction on the first Y-axis body; and wherein the first Y-axis body of the Y-axis body is hinge-coupled to the second Z-axis actuator and the Y-axis actuator is configured to rotate the Y-axis body in one direction to intersect perpendicularly with the Z-axis body, or rotate the Y-axis body in the opposite direction to be seated parallel to the Z-axis body. Claim 2 A construction 3D printer according to claim 1, wherein the X-axis body includes a pair of X-axis rails extended in the X-axis direction, and the Z-axis body is configured to move back and forth in the X-axis direction along the pair of X-axis rails. Claim 3 A construction 3D printer according to paragraph 2, further comprising an X-axis actuator configured to move the Z-axis body back and forth in the X-axis direction along the pair of X-axis rails. Claim 4 A construction 3D printer according to claim 1, further comprising a plurality of drive wheels coupled to the X-axis body and configured to move the X-axis body. Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 A construction 3D printer according to claim 1, wherein the Z-axis body includes two pairs of Z-axis rails extended in the Z-axis direction, and the Y-axis body is configured to move up and down in the Z-axis direction along the two pairs of Z-axis rails. Claim 10 delete Claim 11 delete Claim 12 A construction 3D printer according to claim 1, wherein the first Y-axis body includes an LM guide rail and the second Y-axis body includes an LM guide block. Claim 13 delete Claim 14 A 3D printer for construction according to claim 1, wherein the Y-axis actuator comprises a cylinder tube coupled to the second Z-axis actuator and a piston rod coupled to the first Y-axis body and configured to slide within the cylinder tube. Claim 15 A construction 3D printer according to claim 1, further comprising a printer head coupled to the second Y-axis body. Claim 16 A method of operating a construction 3D printer comprising an X-axis body, a brace, a Z-axis body, a Y-axis body, and a mixer car, comprising: a step (S1) of connecting the mixer car to the X-axis body via the brace; a step (S10) of rotating the Y-axis body counterclockwise to intersect perpendicularly with the Z-axis body while the Z-axis body and the Y-axis body are lying horizontally on the X-axis body; a step (S20) of rotating the Z-axis body counterclockwise to set it up perpendicularly with respect to the X-axis body; a step (S30) of discharging construction material through the printer head while performing a first action of moving the Z-axis body forward and backward in the X-axis direction, a second action of raising and lowering the Y-axis body in the Z-axis direction relative to the Z-axis body, a third action of moving a part of the Y-axis body forward and backward in the Y-axis direction to move a printer head coupled to the Y-axis body forward and backward in the Y-axis direction, or a combination of these actions; a step (S40) of moving the Z-axis body backward as much as possible in the X-axis direction; and a step of rotating the Z-axis body clockwise to... A method of operating a construction 3D printer comprising the steps of: laying horizontally on an X-axis body (S50); and rotating the Y-axis body clockwise to place it parallel on the Z-axis body (S60), wherein the brace is connected to the mixer car to prevent the construction 3D printer from tipping over and is configured to improve the stability of the overall structure by securing a moment arm. Claim 17 delete Claim 18 A method of operating a construction 3D printer according to claim 16, further comprising the step (S2) of moving the construction 3D printer before or after the above step (S30). Claim 19 delete Claim 20 A method of operating a construction 3D printer according to claim 16, further comprising the step (S3) of separating the mixer car from the X-axis body after the above step (S30).

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