Automatic unloading mechanism and 3D printer

Abstract

Automatic unloading mechanism, characterized in that it includes: a print platform assembly comprising a print platform, a drive belt arranged on the print platform, and a first drive element geared to the drive belt, wherein the first drive element is configured to drive the drive belt to move a model in a first direction; and An unloading assembly comprising a locking bar and a second drive element geared to the locking bar, wherein the second drive element is configured to drive the locking bar to move to a first position to avoid the model, so that the model is moved by the drive belt in the first direction, or to drive the locking bar to move to a second position to prevent the model from being moved by the drive belt in the first direction, so that the model is unloaded from the print platform assembly.

Description

Technical field

[0001] The present application relates to the field of 3D printing, and in particular to an automatic unloading mechanism and a 3D printer. State of the art

[0002] Fused Deposition Modeling (FDM) is a technology in which a 3D model is created by depositing molten materials layer by layer. However, conventional 3D printers lack a satisfactory unloading mechanism. After each print, an operator must manually remove the model from the printer using a tool. This unloading process is not only time-consuming and labor-intensive, but can also easily damage the model if handled carelessly, significantly impacting printing efficiency and quality. Disclosure of the invention

[0003] The present application provides an automatic unloading mechanism and a 3D printer in which a model can be quickly and effectively unloaded from a print platform assembly without the need for manual unloading, thereby improving printing efficiency and print quality.

[0004] The automatic unloading mechanism provided by the present application includes: a print platform assembly comprising a print platform, a drive belt arranged on the print platform, and a first drive element geared to the drive belt, wherein the first drive element is configured to drive the drive belt to move a model in a first direction; and An unloading assembly comprising a locking bar and a second drive element geared to the locking bar, wherein the second drive element is configured to drive the locking bar to move to a first position to avoid the model, so that the model is moved by the drive belt in the first direction, or to drive the locking bar to move to a second position to prevent the model from being moved by the drive belt in the first direction, so that the model is unloaded from the print platform assembly.

[0005] Furthermore, it is provided that the second drive element is configured to drive the locking rod to rotate or move it.

[0006] Furthermore, it is provided that the first direction is inclined relative to a horizontal plane, with the angle between the first direction and the horizontal plane being between 15° and 45°.

[0007] Furthermore, the printing platform is designed to have an inclined mounting surface.

[0008] The drive belt is mounted on the mounting surface of the printing platform.

[0009] Furthermore, the automatic unloading mechanism is provided to include a collection assembly, wherein the collection assembly is connected to the printing platform and coupled to one end of the drive belt, and wherein the collection assembly is configured to collect a dropped model.

[0010] Furthermore, it is provided that the automatic unloading mechanism also includes a hot bed assembly, wherein the hot bed assembly is mounted on the drive belt.

[0011] The 3D printer provided by the present application includes one of the automatic unloading mechanisms described above.

[0012] Furthermore, the printer is designed to include a support frame connected to the printing platform and a nozzle assembly connected to the support frame.

[0013] The nozzle assembly is movable in a second direction and a third direction, with the first direction, the second direction and the third direction being perpendicular to each other.

[0014] The unloading assembly is connected to the support frame, and the movement trajectory of the blocking rod avoids the nozzle assembly.

[0015] Furthermore, it is provided that the support frame includes two support arms and a connecting arm connected to the two support arms.

[0016] The two support arms are each connected to the printing platform and arranged on two sides of the drive belt.

[0017] The unloading assembly is connected to one of the support arms and is located near a lower end of the support arm.

[0018] The nozzle assembly is connected to the connecting arm.

[0019] Furthermore, it is provided that the locking bar has a length that is equal to or greater than the distance between the two support arms.

[0020] Compared to the prior art, the present application has the following advantageous features: The automatic unloading mechanism and the 3D printer comprise the print platform assembly and the unloading assembly, wherein the first drive element of the print platform assembly can drive the drive belt to move the model in the first direction. Before the start of a printing process, the second drive element of the unloading assembly can drive the locking bar to move it to the first position to clear the model, thus allowing the model to be moved in the first direction by the drive belt and preventing the locking bar from interfering with the printing process. After completion of the printing process, the second drive element can drive the locking bar to move it to the second position to prevent the model from being moved in the first direction by the drive belt.In this way, the model is quickly and effectively unloaded from the print platform assembly without easily damaging the model, thus improving printing efficiency and print quality. Brief description of the characters Fig. Figure 1 shows a schematic view of an initial state of a 3D printer according to an embodiment of the present application; Fig. Figure 2 shows a schematic view of a pressure state of the in Fig. 1 of the 3D printers shown; Fig. Figure 3 shows a schematic view of a state of the in Fig. 1. 3D printer shown, in which a printing process is completed; Fig. Figure 4 shows a schematic view of a discharge state of the [unclear text]. Fig. 1 of the 3D printers shown; and Fig. Figure 5 shows a schematic view of a state of the in Fig. 1. 3D printer shown, in which an unloading process is completed.

[0021] Reference numeral list: 1-Print platform assembly (101-Print platform (1011-Mounting surface), 102-Drive belt), 2-Discharge assembly (201-Locking rod (2011-Rotary shaft, 2012-Rod body, L1-Length of locking rod), 202-Second drive element), 3-Model, 4-Nozzle assembly, 5-Collector assembly (501-Collector plate), 6-Support frame (601-Support arm, 602-Support arm, 603-Connecting arm, L2-Distance between the two support arms). Detailed descriptions

[0022] To facilitate understanding of the present application, it is described in more detail below with reference to the corresponding drawings. Preferred embodiments of the present application are illustrated in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described here. On the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present application.

[0023] It should be noted that when an element is described as "attached" to another element, it can be directly attached to the other element or there can be an element between them. When an element is considered to be "connected" to another element, it can be directly attached to the other element or there can be an element between them.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as they are generally understood by a person skilled in the technical field to which the present application belongs. The terms used in the description of the present application serve only to describe the problem of the specific embodiments without limiting the application.

[0025] With reference to Fig. 1 to Fig. 5 comprises an automatic unloading mechanism according to an embodiment of the present application, comprising a pressure platform assembly 1 and an unloading assembly 2. The pressure platform assembly 1 comprises a pressure platform 101, a drive belt 102, and a first drive element (not shown in the figures). The drive belt 102 is mounted on the pressure platform 101. The first drive element is geared to the drive belt 102, and the first drive element can be used to drive the drive belt 102 such that it displaces a model 3 in a first direction. The unloading assembly 2 comprises a locking rod 201 and a second drive element 202. The second drive element 202 is geared to the locking rod 201.The second drive element 202 is used to drive the locking rod 201 so that it is moved to a first position to avoid the model 3, so that the model 3 can move in the first direction with the drive belt 102, as shown in . Fig. Figures 1 to 3 show the second drive element 202, which is also used to drive the locking rod 201 to move it to a second position to prevent the model 3 from being moved in the first direction by the drive belt 102, thus allowing the model 3 to be unloaded from the print platform assembly 1, as shown in Fig. 4 and Fig. 5 shown.

[0026] The automatic unloading mechanism according to the embodiment of the present application comprises the printing platform assembly 1 and the unloading assembly 2, wherein the first drive element of the printing platform assembly 1 can drive the drive belt 102 such that it moves the model 3 in the first direction. Before the start of a printing process, the second drive element 202 of the unloading assembly 2 can drive the locking bar 201 such that it is moved to the first position to move out of the way of the model 3, so that the model 3 can be moved in the first direction by the drive belt 102, thus preventing the locking bar 201 from interfering with the printing of the model 3. After completion of the printing process, the second drive element 202 can drive the locking bar 201 such that it is moved to the second position to prevent the model 3 from being moved in the first direction by the drive belt 102.In this way, the Model 3 is quickly and effectively unloaded from the print platform assembly 1 without easily damaging the Model 3, thus improving printing efficiency and print quality.

[0027] Optionally, the second drive element 202 can be used to drive the locking rod 201 so that it is moved upwards into the first position to avoid the model 3, allowing the model 3 to move in the first direction with the drive belt 102, as shown in Fig. Figures 1 to 3 show the second drive element 202. The second drive element 202 can also be used to drive the locking rod 201 so that it is moved downwards to the second position and locks the model 3 to prevent the model 3 from being moved in the first direction by the drive belt 102, thereby unloading the model 3 from the print platform assembly 1, as shown in Fig. 4 and Fig. 5 shown. The blocking rod 201 not only takes up less space and does not increase the size of the 3D printer, but also does not interfere with the printing of model 3.

[0028] The first drive element can be a motor. It is understood that the first drive element can also be other drive devices, as long as the first drive element can drive the drive belt 102 in such a way that it moves the model 3 in a first direction.

[0029] The drive belt 102 has an existing structure. And in the present application, the structure of the drive belt 102 is not restricted. By way of example, the printing platform assembly 1 can also include a drive shaft (not shown in the figures) and an output shaft (not shown in the figures). The drive belt 102 is connected to the drive shaft and the output shaft, respectively, via a gear mechanism. The first drive element is connected to the drive shaft via a gear mechanism. The first drive element can drive the drive shaft to rotate and thereby drive the drive belt 102 in such a way that it displaces the model 3 in the first direction.

[0030] With reference to Fig. 1 to Fig. 5 The second drive element 202 can be used to drive the locking rod 201 to rotate or move it.

[0031] With reference to Fig. 1 to Fig. 5 For example, the second drive element 202 can be used to drive the locking rod 201 so that it moves upwards to the first position, as shown in Fig. 1 to Fig. 3 shown, is rotated to allow evasive action, with the second drive element 202 also being used to drive the blocking rod 201 downwards to the second position, as shown in Fig. 4 and Fig. 5 shown, is rotated to block the printed model 3.

[0032] In particular, the second drive element 202 may be a motor.

[0033] The locking rod 201 can be connected to the output shaft of the second drive element 202. Before the start of a printing process, the second drive element 202 can drive the locking rod 201 so that it moves upwards to the first position, as shown in Fig. 1 to Fig. As shown in Figure 3, the second drive element 202 is rotated to avoid the model 3 or a nozzle assembly 4, thus preventing interference with the model 3 or the nozzle assembly 4 and ensuring continued print quality. After completion of the printing process, the second drive element 202 can also drive the locking rod 201 so that it moves downwards to the second position, as shown in Figure 3. Fig. 4 and Fig. 5 shown, is rotated to block the printed model 3 and thereby prevent the model 3 from continuing to be moved in the first direction by the drive belt 102, so that the model 3 is unloaded from the print platform assembly 1.

[0034] For example, the drive belt 102 can be used to directly pick up the model 3 printed by the nozzle assembly 4, and the structure is simple. After completion of the printing process, the second drive element 202 can drive the locking rod 201 so that it moves downwards to the second position, as shown in Fig. 4 and Fig. As shown in Figure 5, the model is rotated. Then the first drive element drives the drive belt 102 so that it moves the printed model 3 backwards in the first direction. When the model 3, with reference to Fig. Once model 3 is moved by the drive belt 102 until it rests against the locking bar 201, it can no longer be moved backwards in the first direction by the drive belt 102. Driven by the first drive element, the drive belt 102 continues to move backwards in the first direction, thus disengaging model 3 from the drive belt 102 and releasing it from the drive belt 102.

[0035] It is understood that in other embodiments, the drive belt 102 may not be used to directly hold the model 3 printed by the nozzle assembly 4. For example, a washer (not shown in the figures) for 3D printing can be mounted on the drive belt 102 to protect it. The washer is attached to the drive belt 102 and can be used to hold the model 3. As the model 3 moves with the drive belt 102 until it contacts the locking rod 201, the washer, driven by the first drive element, moves further backward in the first direction with the drive belt 102, so that the model 3 is released from the washer and no longer adheres to it.

[0036] It is understood that in further embodiments, the second drive element 202 can be used to drive the locking rod 201 in such a way that it is moved in a different manner. For example, the second drive element 202 can be used to drive the locking rod 201 so that it is moved upwards or downwards, provided that the locking rod 201 can unload the model 3 and does not interfere with normal printing. This is not described in detail.

[0037] With reference to Fig. 1 to Fig. 5 is inclined in the first direction relative to a horizontal plane. Because the first direction is inclined relative to the horizontal plane, the model 3, unloaded from the printing platform assembly 1, can fall forward and downward in the first direction under the influence of gravity relative to the drive belt 102 until it is completely separated from the printing platform assembly 1, thus achieving effective unloading. Furthermore, it is not necessary for an operator to remove the unloaded model 3 from the printing platform assembly 1, which is faster and less laborious. At the same time, the quality of the model 3 is further ensured.

[0038] For example, the angle α between the first direction and the horizontal plane can be between 15° and 45°. This not only ensures that the model 3 can fall effectively and unloading can be enabled, but also prevents the model 3 from rolling off the drive belt 102 due to an excessively large angle α, thus further ensuring the quality of the model 3.

[0039] It is understood that in further embodiments the angle α between the first direction and the horizontal plane may have different values, as long as it is ensured that the model 3 can effectively fall and is not damaged when falling.

[0040] In some examples, the printing platform 101 has a mounting surface 1011. The mounting surface 1011 can be arranged at an angle relative to the horizontal plane. With reference to Fig. 1 to Fig. 5. The drive belt 102 is mounted on the mounting surface 1011 of the printing platform 101. Since the mounting surface 1011 is arranged at an inclination relative to the horizontal plane, the drive belt 102 mounted on the mounting surface 1011 is also inclined relative to the horizontal plane, i.e., its first direction is inclined relative to the horizontal plane.

[0041] The automatic unloading mechanism may further include a collection assembly 5. The collection assembly 5 is connected to the printing platform 101, and the collection assembly 5 is coupled to one end of the drive belt 102. The collection assembly 5 can be used to collect the fallen model 3 and can further protect the model 3, as shown in Fig. 5 shown.

[0042] With reference to Fig. 1 to Fig. The assembly 5 can include a collection plate 501. The collection plate 501 can be attached to the printing platform 101 and coupled to a first end of the drive belt 102, which is located in the forward direction of the first direction, in order to facilitate the collection of the fallen model 3.

[0043] With reference to Fig. 1 to Fig. 5 The collection plate 501 can be arranged at an angle so that the model 3 can fall down faster and more effectively until it is separated from the print platform assembly 1.

[0044] For example, the inclination angle of the collecting plate 501 can be equal to the inclination angle of the mounting surface 1011, as shown in Fig. 1 to Fig. 5 shown.

[0045] It is understood that in further embodiments the assembly 5 can also assume other structures, provided that it is ensured that the assembly 5 can effectively collect the fallen model 3.

[0046] The automatic unloading mechanism can further include a heated bed assembly (not shown in the figures), the heated bed assembly being mounted on the drive belt 102. The heated bed assembly 3 can heat the drive belt 102 to maintain the model 3 at a higher temperature and prevent the material from cooling during the printing process, thereby effectively reducing the risk of warping of the model 3. Simultaneously, the heated bed assembly can also ensure that the hot-melted material maintains its temperature, resulting in stronger fusion and improved print quality.

[0047] The hot bed assembly has an existing structure. And the structure of the hot bed assembly is not restricted in the present application and is therefore not described in detail.

[0048] With reference to Fig. 1 to Fig. 5. According to the embodiment of the present application, the 3D printer may include one of the automatic unloading mechanisms described above.

[0049] With reference to Fig. 1 to Fig. 5. The printer can also include a support frame 6 and a nozzle assembly 4. The support frame 6 is connected to the print platform 101. The nozzle assembly 4 is connected to the support frame 6. The nozzle assembly 4 can move in a second and a third direction. The first, second, and third directions are perpendicular to each other in pairs. The nozzle assembly 4 can move along a preset path relative to the drive belt 102 to achieve precise layer-by-layer stacking and ensure that the printed model 3 meets the design requirements.

[0050] The discharge assembly 2 can be connected to the support frame 6. To avoid interference between the locking rod 201 and the nozzle assembly 4, the movement trajectory of the locking rod 201 can be diverted from the nozzle assembly 4, as shown in Fig. 1 to Fig. Figure 5 shows that the discharge assembly 2 and the nozzle assembly 4 are integrated onto the support frame 6, thus requiring less space and achieving a more compact structure. Furthermore, before the start of a printing process, the second drive element 202 can drive the locking rod 201 upwards to the first position, as shown in Figure 5. Fig. 1 to Fig. 3 shown, is rotated so that the nozzle assembly 4 can be avoided and no interference with the nozzle assembly 4 occurs, which would impair normal printing.

[0051] The support frame 6 mentioned above could be a portal frame, as shown in Fig. 1 to Fig. 5 shown.

[0052] In particular, it refers to Fig. 1 to Fig. 5, wherein the support frame 6 can comprise a support arm 601, a support arm 602, and a connecting arm 603. The connecting arm 603 is connected to both the support arm 601 and the support arm 602. The support arm 601 and the support arm 602 are each attached to the pressure platform 101, and the support arm 601 and the support arm 602 are each arranged on opposite sides of the drive belt 102.

[0053] The unloading assembly 2 can be connected to one of the support arms and positioned near a lower end of the support arm, ensuring that the blocking bar 201 can effectively block the model 3 when it is in the second position.

[0054] The nozzle assembly 4 can be connected to the connecting arm 603. Optionally, the connecting arm 603 can be moved along the support arm 601 and the support arm 602 in the second direction, while the nozzle assembly 4 can be moved along the connecting arm 603 in the third direction, so that the nozzle assembly 4 can be moved according to a preset path to achieve precise printing and ensure print quality.

[0055] For example, with reference to Fig. 1 to Fig. 5. The locking rod 201 and the second drive element 202 are each connected to the support arm 601. The locking rod 201 can comprise a rotating shaft 2011 and a cutter body 2012, which are attached to each other as a single unit. The rotating shaft 2011 is formed at one end of the cutter body 2012, and the axis of the rotating shaft 2011 is perpendicular to the axis of the cutter body 2012. The rotating shaft 2011 of the locking rod 201 can be rotatably connected to the support arm 601, with a gap between the cutter body 2012 of the locking rod 201 and the support arm 601. This gap facilitates the movement of the nozzle assembly 4 and prevents interference between the cutter body 2012 and the nozzle assembly 4. The second drive element 202 can be attached to the support arm 601. And the output shaft of the second drive element 202 can pass through the support arm 601 and be attached coaxially with the rotary shaft 2011 of the locking rod 201.

[0056] When the second drive element 202 drives the locking rod 201 so that it is rotated to the first position, the locking rod 201 extends in the second direction, as shown in Fig. 1 to Fig. 3 shown. That is, the free end of the knife body 2012 of the blocking rod 201 is located close to the upper end of the support arm 601 in order to sufficiently avoid interference between the knife body 2012 and the nozzle assembly 4.

[0057] When the second drive element 202 drives the locking rod 201 so that it is rotated to the second position, the locking rod 201 extends in the third direction, as shown in Fig. 4 and Fig. Figure 5 shows that the free end of the knife body 2012 of the locking rod 201 is located close to the lower end of the support arm 602 to sufficiently ensure that the locking rod 201 can effectively block the model 3 so that the model 3 is unloaded from the print platform assembly 1. For example, when the second drive element 202 drives the locking rod 201 to rotate it to the second position, a gap may exist between the knife body 2012 of the locking rod 201 and the drive belt 102, ensuring that the locking rod 201 does not interfere with the movement of the drive belt 102.

[0058] The locking rod 201 has a length L1 that can be equal to or greater than the distance L2 between the support arm 601 and the support arm 602. That is, when the locking rod 201 moves to the second position, as shown in Fig. 4 and Fig. As shown in Figure 5, when rotated, the locking bar 201 spans the support arm 601 and the support arm 602, effectively preventing the Model 3 from passing through the gap between the locking bar 201 and the support arm 602. This ensures that the Model 3 can be unloaded.

[0059] In some embodiments, the working principle of the 3D printer is as follows: It will be on the in Fig. Figure 1 refers to the initial state shown. At this point, the locking rod 201 is in the first position, with the nozzle assembly 4 in its highest position and away from the locking rod 201. After the start of a printing process, the nozzle assembly 4 can be moved as shown in Figure 1. Fig. 2 shown, can be moved in the second and third directions, with the drive belt 102 being able to move the model 3 in the first direction. After completion of the printing process, the nozzle assembly 4 is reset to its initial state, as shown in Fig. Figure 3 is shown. Then the locking rod 201 is rotated downwards to the second position. Subsequently, the first drive element drives the drive belt 102 so that it moves the printed model 3 backwards in the first direction. When the model 3, with reference to Fig. When model 3 is moved by the drive belt 102 until it rests against the locking rod 201, it can no longer be moved backwards in the first direction by the drive belt 102. Driven by the first drive element, the drive belt 102 continues to move backwards in the first direction, so that model 3 is unloaded from the drive belt 102 and no longer adheres to it. Under the influence of gravity, the unloaded model 3 can fall forwards and downwards relative to the drive belt 102 in the first direction towards the collecting assembly 5, as shown in Fig. 5 shown. The second drive element 202 drives the locking rod 201 so that it moves into the Fig. The initial state shown in step 1 is reset and the system waits for the next printing process or starts directly with the next printing process.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of clarity, not all possible combinations of the individual technical features are described in the embodiments above. However, as long as there are no contradictions between the combinations of these technical features, they should be considered within the scope of this description.

[0061] The present application thus relates to an automatic unloading mechanism and a 3D printer. The automatic unloading mechanism comprises: a print platform assembly comprising a print platform, a drive belt arranged on the print platform, and a first drive element geared to the drive belt, wherein the first drive element is configured to drive the drive belt in such a way as to displace a model in a first direction;and an unloading assembly comprising a locking bar and a second drive element geared to the locking bar, the second drive element being configured to drive the locking bar to a first position to avoid the model, thus allowing the model to be moved in the first direction by the drive belt, or to drive the locking bar to a second position to prevent the model from being moved in the first direction by the drive belt, thus allowing the model to be unloaded from the print platform assembly. The present application enables the model to be unloaded quickly and effectively from the print platform assembly without easily damaging the model, thereby improving printing efficiency and print quality.

[0062] The above embodiments represent only the preferred embodiments of the present application, and their description is relatively specific and detailed, but cannot be understood as limiting the scope of the patent. It should be noted that, for the person skilled in the art, several variations and improvements can be made without departing from the concept of the present application, and these fall within the scope of protection of the present application. The scope of protection of the present patent application should therefore depend on the attached claims.

Claims

[1] Automatic unloading mechanism, characterized by that it includes: a print platform assembly comprising a print platform, a drive belt disposed on the print platform, and a first drive element geared to the drive belt, the first drive element configured to drive the drive belt to translate a model in a first direction; and an unloading assembly comprising a blocking bar and a second drive member geared to the blocking bar, the second drive member configured to drive the blocking bar to move to a first position to avoid the model so that the model is translated in the first direction with the drag belt, or to drive the blocking bar to move to a second position to prevent the model from being translated in the first direction with the drag belt so that the model is unloaded from the print platform assembly. [2] Automatic unloading mechanism according to claim 1, characterized by that the second drive element is configured to drive the blocking rod to rotate or move. [3] Automatic unloading mechanism according to claim 1, characterized bythat the first direction is inclined relative to a horizontal plane, the angle between the first direction and the horizontal plane being 15° to 45°. [4] Automatic unloading mechanism according to claim 3, characterized by that the printing platform has an inclined mounting surface, wherein the drive belt is mounted on the mounting surface of the printing platform. [5] Automatic unloading mechanism according to claim 3, characterized by in that the automatic unloading mechanism further comprises a collecting assembly, wherein the collecting assembly is connected to the printing platform and coupled to one end of the pickup belt, and wherein the collecting assembly is configured to collect a dropped model. [6] Automatic unloading mechanism according to claim 1, characterized by that the automatic unloading mechanism further comprises a hot bed assembly, wherein the hot bed assembly is mounted on the drive belt. [7] 3D printer, characterized by that it comprises an automatic unloading mechanism according to one of claims 1 to 6. [8] 3D printer according to claim 7, characterized by that the printer further comprises a support frame connected to the print platform and a nozzle assembly connected to the support frame, wherein the nozzle assembly is displaceable in a second direction and a third direction, the first direction, the second direction and the third direction being perpendicular to each other, wherein the discharge assembly is connected to the support frame, and wherein a movement trajectory of the blocking rod deviates from the nozzle assembly. [9] 3D printer according to claim 7, characterized by that the support frame comprises two support arms and a connecting arm connected to the two support arms, wherein the two support arms are each connected to the printing platform and are arranged on two sides of the drive belt, wherein the unloading assembly is connected to one of the support arms and is arranged near a lower end of the support arm, and wherein the nozzle assembly is connected to the connecting arm. [10] 3D printer according to claim 9, characterized by that the blocking rod has a length equal to or greater than the distance between the two support arms.

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