Flexible cantilever structure for 3D printer and 3D printer

Abstract

The present disclosure provides a flexible cantilever structure for a 3D printer and a 3D printer. Specifically disclosed is that the flexible cantilever structure for a 3D printer includes: a body configured to be mounted to a printing platform of the 3D printer, the printing platform including a printing plane for carrying a printed object; a first cantilever extending from the body; a second cantilever extending from the body, the second cantilever including a proximal end connected to the body and a distal end opposite to the proximal end; a connecting portion, the first cantilever and the distal end of the second cantilever being connected via the connecting portion; and a sensor mounted to the second cantilever, the sensor being configured to generate a sensing signal indicative of a force applied to the printing plane by sensing a deformation of the flexible cantilever structure caused by the force applied to the printing plane.

Description

[0001] This application is a divisional application of the invention patent application with the application number 202111269489.9, the application date of October 29, 2021, and the invention title of "3D Printer and Method for 3D Printer". Technical Field

[0002] The present disclosure generally relates to the field of 3D printing technology, and particularly relates to a 3D printer for achieving leveling of a printing platform and a flexible cantilever structure for a 3D printer. Background Art

[0003] A 3D printer (also known as a three-dimensional printer or a stereoscopic printer) constructs a three-dimensional object by layer-by-layer printing. In related technologies, a 3D printer includes a print head for extruding printing material and a printing platform for depositing the printing material to form a three-dimensional object. The print head is configured to be movable relative to the printing platform and extrude the printing material onto the surface of the printing platform while moving. The printing material is deposited layer by layer on the surface of the printing platform and fused together to print out a three-dimensional object.

[0004] The printing accuracy of a three-dimensional object is affected by various factors. Whether the surface of the printing platform on which the three-dimensional object is formed is in a predetermined position and angle, especially whether it is a horizontal plane, is one of the crucial factors determining the printing accuracy. Therefore, it is necessary to further improve the positioning and leveling technology of the printing platform.

[0005] The methods described in this section are not necessarily methods that have been previously conceived or adopted. Unless otherwise specified, any method described in this section should not be considered prior art merely because it is included in this section. Similarly, unless otherwise specified, the problems mentioned in this section should not be considered to have been recognized in any prior art. Summary of the Invention

[0006] Embodiments of the present disclosure provide a flexible cantilever structure for a 3D printer and a 3D printer.

[0007] According to one aspect of the present disclosure, there is provided a flexible cantilever structure for a 3D printer, the flexible cantilever structure including: a body configured to be mounted to a printing platform of the 3D printer, the printing platform including a printing plane for carrying a printed object; a first cantilever extending from the body; a second cantilever extending from the body, the second cantilever including a proximal end connected to the body and a distal end opposite to the proximal end; a connecting portion, the first cantilever and the distal end of the second cantilever being connected via the connecting portion; and a sensor mounted to the second cantilever, the sensor being configured to generate a sensing signal indicating a force applied to the printing plane by sensing a deformation of the flexible cantilever structure caused by the force applied to the printing plane.

[0008] According to another aspect of the present disclosure, there is provided a 3D printer. The 3D printer includes: a printing platform including a printing plane for carrying a printed object; a print head configured to be movable relative to the printing platform; and at least three flexible cantilever structures, each flexible cantilever structure being the flexible cantilever structure according to any one of claims 1-4, wherein the at least three flexible cantilever structures are respectively mounted at different positions of the printing platform.

[0009] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0011] Figure 1 A structural diagram of a 3D printer according to an embodiment of the present disclosure is shown.

[0012] Figure 2 A flexible cantilever structure according to an embodiment of the present disclosure is shown.

[0013] Figure 3 A layout structure for mounting a sensor of a 3D printer according to an embodiment of the present disclosure is shown.

[0014] Figure 4 Shown is Figure 3 A partial enlarged view of the layout structure in

[0015] Figure 5Shows another arrangement structure for installing sensors of a 3D printer according to an embodiment of the present disclosure.

[0016] Figure 6 Shows a flowchart of a method for a 3D printer according to an embodiment of the present disclosure.

[0017] Figure 7 Shows that according to an embodiment of the present disclosure, in Figure 6 the method, a flowchart of an example operation for determining that the print head has contacted the printing plane is shown. Detailed Description of the Invention

[0018] The following describes exemplary embodiments of the present disclosure with reference to the accompanying drawings. Various details of the embodiments of the present disclosure are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope of the present disclosure. Similarly, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0019] In the present disclosure, unless otherwise specified, the terms "first", "second", etc. are used to describe various elements and are not intended to limit the positional relationship, timing relationship, or importance relationship of these elements. Such terms are only used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of the element, and in certain cases, based on the context description, they may also refer to different instances.

[0020] In the description of various examples in the present disclosure, the terms used are only for the purpose of describing specific examples and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element may be one or more. In addition, the term "and / or" used in the present disclosure covers any one of the listed items and all possible combinations.

[0021] In extrusion-based (e.g., fused deposition modeling) 3D printing technology, the printing material extruded from the print head is deposited layer by layer on a plane defined by the printing platform. Generally, this plane needs to be a flat surface and perpendicular to the Z-axis direction of the 3D printer. Otherwise, the printing material will be misaligned during the layer-by-layer deposition process. This will result in printing defects such as skewing of the vertical axis of the printed object and degradation of the shape accuracy, and may even lead to printing failure.

[0022] Therefore, in order to ensure the printing quality and success rate, it is necessary to level the printing platform before printing. The leveling operation at least includes: detecting whether the plane defined by the printing platform is flat, and calibrating the position of the plane to adjust it to be perpendicular to the Z-axis direction of the print head. Related technologies include manual and automatic leveling solutions. The manual leveling solution realizes leveling by the operator manually operating the mechanical structure, and has defects such as complex operation and large influence of human factors. Although the automatic leveling solution can reduce the influence of manual operation, it inevitably increases the complexity of the structure and circuit of the 3D printer and thus increases the cost. Moreover, there is still a large room for improvement in leveling accuracy and reliability.

[0023] Embodiments of the present disclosure provide an improved 3D printer so as to be able to overcome at least one of the above problems.

[0024] Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0025] Figure 1 Fig. 100 shows a 3D printer 100 according to an embodiment of the present disclosure. The 3D printer 100 includes a printing platform 110 and a print head 120. The print head 120 is configured to be movable relative to the printing platform 110. The printing platform 110 defines a printing plane 112. The printing material extruded from the print head 120 is deposited layer by layer on the printing plane 112 defined by the printing platform 110, thereby printing a three-dimensional object.

[0026] The 3D printer 100 further includes at least one sensor 130, as will be described in detail below in conjunction with Figures 2 - 6 The at least one sensor 130 is mounted on the printing platform 110 and is configured to generate a sensing signal indicating the force applied to the printing plane 112. Mounting the at least one sensor on the printing platform 110 at least helps to simplify the installation structure of the sensor and is easy for circuit wiring.

[0027] The sensor 130 can be any type of sensor capable of generating the above sensing signal. In one example, the sensor is a piezoelectric ceramic sensor. The force applied to the printing plane 112 can cause the piezoelectric ceramic sensor to undergo corresponding deformation. The piezoelectric ceramic sensor is further capable of generating a sensing signal (e.g., potential difference) indicating the force applied to the printing plane 112 based on the amount of deformation. The piezoelectric ceramic sensor has low cost and high measurement reliability. Using the piezoelectric ceramic sensor at least helps to reduce costs and improve reliability.

[0028] In addition, the 3D printer 100 further includes a processor for controlling the printing operation of the 3D printer 100. The processor may be integrated into the 3D printer 100. In another embodiment, the processor may be independent of the 3D printer 100 and communicate with the 3D printer 100 by wired or wireless means. Before performing the printing operation, the processor may control the 3D printer 100 to achieve automatic leveling of the printing platform 110. During the automatic leveling operation, the processor may control the print head 120 to move from a predetermined position towards the printing plane 112. When the print head 120 contacts the printing plane 112, the print head 120 applies a force to the printing platform 110. The force generated by this contact can be sensed by at least one of the above sensors 130 and indicated by the sensing signal of the sensor 130. Based on this sensing signal, the processor can determine that the print head 120 has contacted the printing plane 112. Further, in response to determining that the print head 120 has contacted the printing plane 112, the processor can determine the distance that the print head 120 has moved in the Z-axis direction of the printer from the above predetermined position. According to the determined distance, the processor can determine the position of the printing plane 112 in the said direction. In one example, as needed, multiple predetermined positions at the same height may be selected. The processor may control the print head 120 to move from these multiple predetermined positions towards the printing plane 112 and determine multiple distances. By comparing the multiple distances, it can be determined whether the printing plane 112 is a flat surface. Moreover, by determining the distances that the print head 120 has moved in the Z-axis direction of the printer 100 from at least three non-collinear predetermined positions, the position of the printing plane 112 can be calibrated in the coordinate system of the printer, thereby determining whether the printing plane 112 is perpendicular to the Z-axis direction of the 3D printer 100.

[0029] Any number of sensors 130 can be installed on the printing platform 110. In one example, three sensors 130 can be selected and installed at three non - collinear positions on the printing platform 110 respectively. In this case, the processor can determine the resultant force applied to the printing plane 112 based on the sensing signals from the three sensors 130. In response to the resultant force exceeding a predetermined threshold, the processor determines that the print head 120 has contacted the printing plane 112. Compared with judging only depending on the sensing signal of a single sensor, using three sensors 130 and calculating the resultant force on the printing platform 110 based on the three sensing signals ensures that: no matter where the print head 120 contacts the printing plane 112, it can reliably sense and determine that the print head 120 has contacted the printing plane 112. Moreover, there are often many interference factors in the environment where the 3D printer 100 is located, which cause fluctuations in the measured values of the sensors. Comparing the resultant force with the predetermined threshold can reduce the false judgment caused by the fluctuations in the measured values of a single sensor, and further improve the reliability of sensing and judgment. On the other hand, since calculating the resultant force weakens the fluctuations in the measured values of a single sensor to a certain extent, the predetermined threshold can be determined more reasonably without sacrificing sensitivity to ensure reliability. For example, the predetermined threshold can be determined to be as low as possible, so as to improve the sensitivity of judging the occurrence of contact.

[0030] In addition, the sensor 130 can be installed on the printing platform 110 in any way as long as it can sense the force applied to the printing plane 112. In one example, as Figure 1 shown, the sensor 130 is installed on the flexible cantilever structure 115 of the printing platform 110. The flexible cantilever structure 115 is configured to be deformed by the force applied to the printing plane 112. Installing the sensor through the flexible cantilever structure 115 can make the sensor more sensitive and reliable to sense the force applied to the printing plane 112.

[0031] Figure 2 The flexible cantilever structure 115 according to an embodiment of the present disclosure is shown. The flexible cantilever structure 115 includes: a body 210; a first cantilever 220 extending from the body 210; and a second cantilever 230 extending from the body 210. The first cantilever 220 and the second cantilever 230 are arranged to be connected at a position 240 away from the body 210, so that the deformation of the first cantilever 220 is transmitted to the second cantilever 230. The sensor 130 is installed on the second cantilever 230. In this way, the deformation amount of the second cantilever 230 can be adjusted by adjusting the connection position and structure of the first cantilever 220 and the second cantilever 230, so as to adjust the sensitivity of the sensor 130. This makes the printing platform layout structure with sensors of the present disclosure portable. By finely adjusting the flexible cantilever structure, the printing platform layout structure according to the present disclosure can be adapted to a variety of 3D printers with different load requirements.Figure 2 A possible structure is shown. As shown, the first cantilever 220 and the second cantilever 230 extend in the same direction from a portion 215 of the body 210, and the first cantilever 220 is arranged to surround the outside of the second cantilever 230. The first cantilever 220 and the second cantilever 230 are connected via a connecting portion 260 at a position 240 opposite to the portion 215 of the body 210.

[0032] Furthermore, Figure 3 and Figure 5 Two different exemplary arrangement structures for installing a sensor according to embodiments of the present disclosure are respectively shown. By including the above flexible cantilever structure in the arrangement structure and using the flexible cantilever structure to mount the sensor to the printing platform, the requirements for sensing sensitivity and strength can be met through a simple structural design. In particular, the entire arrangement structure for installing the sensor no longer needs to include an additional structure designed for installing the sensor, further reducing the structural complexity and cost.

[0033] First, look at Figure 3 , the printing platform 110 is arranged to include a printing plate 310 and a printing plate bracket 320 that supports the printing plate 310. The printing plate 310 provides a printing plane 112. Three flexible cantilever structures 115 are installed between the printing plate 310 and the printing plate bracket 320. Three sensors 130 are respectively installed on the three flexible cantilever structures 115. The printing plate 310 and the printing plate bracket 320 can adopt any suitable shape and configuration as needed. The three flexible cantilever structures 115 can be installed at any position. In Figure 3 's embodiment, the printing plate 310 is rectangular. Correspondingly, the printing plate bracket 320 is also rectangular. Two of the three flexible cantilever structures 115 are arranged at one edge of the rectangle and the remaining one of the three flexible cantilever structures 115 is arranged at the opposite edge.

[0034] Figure 4 shows Figure 3 a partial enlarged view of the arrangement structure in Figure 4 As shown, the body 210 of the flexible cantilever structure 115 is connected to the upper surface of the printing plate bracket 320. The first cantilever 220 of the flexible cantilever structure 115 is connected to the lower surface of the printing plate 310. The sensor 130 is installed on the second cantilever 230 of the flexible cantilever structure 115. In this way, when a force is applied to the printing plane 112, the first cantilever 220 of the flexible cantilever structure 115 will be deformed due to being connected to the printing plate 130 that provides the printing plane 112. As described above regarding Figure 2As described in detail, the first cantilever 220 is connected to the second cantilever 230 such that the deformation of the first cantilever 220 is transmitted to the second cantilever 230. The sensor 130 mounted on the second cantilever 230 senses the deformation and correspondingly generates a sensing signal indicating the force applied to the printing plate 310.

[0035] The first cantilever 220 of the flexible cantilever structure 115 can be connected to the lower surface of the printing plate 310 in any manner. In Figure 3 , Figure 4 In the illustrated embodiment, the first cantilever 220 is bolted to the lower surface of the printing plate 310. In one example, a spring 410 is further sleeved outside the bolt connection to lift the printing plate 310 relative to the flexible cantilever structure 115, so as to form a gap therebetween. This gap can prevent the printing plate 310 from touching other parts of the flexible cantilever structure 115, resulting in abnormal deformation of the flexible cantilever structure 115. The spring 410 can be replaced by spacers such as gaskets and plastic sleeves.

[0036] Figure 5 The illustrated exemplary arrangement structure is similar to Figure 4 . The printing platform 110 is also provided to include a printing plate 510 and a printing plate bracket 520 for supporting the printing plate 510. The printing plate 510 provides a printing plane 112. Three sensors 130 are respectively mounted on three flexible cantilever structures 115.

[0037] Figure 5 The difference between the illustrated exemplary arrangement structure and Figure 4 is that: the flexible cantilever structure 115 is mounted below the printing plate bracket 520. The body 210 of the flexible cantilever structure 115 is connected to the lower surface of the printing plate bracket 520. The first cantilever 220 of the flexible cantilever structure 115 is connected to other structures of the 3D printer. In this way, when a force is applied to the printing plane 112, the force is transmitted from the printing plate 130 providing the printing plane 112 to the printing plate bracket 520, and the body 210 of the flexible cantilever structure 115 will be deformed due to being connected to the printing plate bracket 520. However, the first cantilever 510 will not be deformed due to being connected to other structures of the 3D printer. The sensor 130 mounted on the second cantilever 230 senses the deformation and correspondingly generates a sensing signal indicating the force applied to the printing plate bracket 520. It should be understood that Figure 5 The principle of action of the illustrated arrangement structure for generating a sensing signal in response to the force applied to the printing plane 112 is the same as that of Figure 4 The illustrated arrangement structure. The difference is that in Figure 5 The deformation process of the flexible cantilever structure 115 in the illustrated arrangement structure is opposite to that in Figure 4 .

[0038] The body 210 of the flexible cantilever structure 115 can be connected to the lower surface of the printing flatbed bracket 520 in any way. In Figure 5 the illustrated embodiment, the body 210 is bolted to the lower surface of the printing flatbed bracket 520. In one example, a gasket is provided at the bolt connection to form a gap between the flexible cantilever structure 115 and the printing flatbed bracket 520. This gap can prevent the printing flatbed bracket 520 from touching other parts of the flexible cantilever structure 115, resulting in abnormal deformation of the flexible cantilever structure 115. The gasket can be replaced by spacers such as sleeves.

[0039] In addition, Figure 5 the illustrated exemplary arrangement is also different from Figure 4 that: the three flexible cantilever structures 115 are respectively arranged at three different edges of the rectangular printing flatbed bracket 520.

[0040] In some embodiments, the 3D printer 100 further includes a lifting mechanism 150 ( Figure 1 ). The processor is configured to control the lifting mechanism 150 according to the determined position of the printing plane 112 to achieve leveling of the printing plane 112. In Figure 3 , Figure 4 the illustrated arrangement, the lifting mechanism 150 is connected to the printing flatbed bracket 320 to adjust the vertical position of the printing plane 112. In Figure 5 the illustrated arrangement, the lifting mechanism 150 is connected to the first cantilever 220 of the three flexible cantilever structures 115 to adjust the vertical position of the printing plane 112.

[0041] Embodiments of the present disclosure also provide a method for a 3D printer to achieve improved leveling. Figure 6 A flowchart of a method 600 for a 3D printer according to an embodiment of the present disclosure is shown. As Figure 6 shown, the method 600 includes steps 610 to 640.

[0042] In step 610, the print head is controlled by the processor to move from a predetermined position towards the printing plane. In step 620, based on the sensing signals from at least one sensor, the processor determines that the print head has contacted the printing plane. When the print head contacts the printing plane, a force is applied to the printing plane. The force generated by this contact can be sensed by at least one sensor and indicated by the sensing signal of the sensor. Step 620 can determine that the print head has contacted the printing plane based on this sensing signal. In step 630, in response to determining that the print head has contacted the printing plane, the processor determines the distance that the print head has moved in the Z-axis direction of the 3D printer from the predetermined position. In step 640, based on the determined distance, the processor determines the position of the printing plane in the Z-axis direction. In one example, as needed, multiple predetermined positions at the same height can be selected. The print head is controlled to move from these multiple predetermined positions towards the printing plane and multiple distances are determined. By comparing the multiple distances, it can be determined whether the printing plane is a flat surface. Moreover, by determining the distances that the print head has moved in the Z-axis direction of the printer from at least three non-collinear predetermined positions, the position of the printing plane can be calibrated in the coordinate system of the printer, thereby determining whether the printing plane is perpendicular to the Z-axis direction of the 3D printer.

[0043] As Figure 7 shown, the processor determining that the print head has contacted the printing plane (step 620) further includes step 710 and step 720. In step 710, based on the sensing signals from at least three sensors, the processor determines the resultant force applied to the printing plane. In step 720, in response to the resultant force exceeding a predetermined threshold, the processor determines that the print head has contacted the printing plane.

[0044] Returning to reference Figure 6 , in some embodiments, the method 600 according to the embodiments of the present disclosure may further include step 650. In step 650, based on the determined position of the printing plane in the Z-axis direction, the processor controls multiple lifting mechanisms to achieve leveling of the printing plane.

[0045] It should be understood that in this specification, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship or dimensions based on the orientation or position relationship or dimensions shown in the drawings. Using these terms is only for the convenience of description and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection scope of the present disclosure.

[0046] Furthermore, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specifically and clearly defined.

[0047] In the present disclosure, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0048] In the present disclosure, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] This specification provides many different embodiments or examples that can be used to implement the present disclosure. It should be understood that these different embodiments or examples are entirely exemplary and are not used to limit the protection scope of the present disclosure in any way. Based on the disclosed content of the specification of the present disclosure, those skilled in the art can conceive of various changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope defined by the appended claims.

Claims

1. A flexible cantilever structure for a 3D printer, the flexible cantilever structure comprising: A body configured to be mounted to a printing platform of the 3D printer, the printing platform including a printing plane for carrying a printed object; A first cantilever extending from the body; A second cantilever extending from the body, the second cantilever including a proximal end connected to the body and a distal end opposite the proximal end; A connecting portion, the distal ends of the first cantilever and the second cantilever being connected via the connecting portion; And A sensor mounted to the second cantilever, the sensor being configured to generate a sensing signal indicative of a force applied to the printing plane by sensing a deformation of the flexible cantilever structure caused by the force applied to the printing plane.

2. The flexible cantilever structure according to claim 1, wherein, The first cantilever and the second cantilever extend from the body in the same direction, and the first cantilever is disposed to surround the outside of the second cantilever such that a gap is formed between the first cantilever and the second cantilever.

3. The flexible cantilever structure according to claim 2, wherein, The connecting portion is disposed in the gap, and the width of the connecting portion is less than the width of the second cantilever.

4. The flexible cantilever structure according to any one of claims 1-3, wherein, The sensor is a piezoelectric ceramic sensor.

5. A 3D printer, comprising: A printing platform including a printing plane for carrying a printed object; A print head configured to be movable relative to the printing platform; And At least three flexible cantilever structures, each flexible cantilever structure being the flexible cantilever structure according to any one of claims 1-4, wherein the at least three flexible cantilever structures are respectively mounted at different positions of the printing platform.

6. The 3D printer according to claim 5, wherein, The printing platform further includes: A printing plate providing the printing plane; and A printing plate bracket supporting the printing plate, Wherein at least one of the at least three flexible cantilever structures is mounted between the printing plate and the plate bracket, and Wherein the body of the at least one flexible cantilever structure is connected to the upper surface of the printing plate bracket, and the first cantilever of the at least one flexible cantilever structure is connected to the lower surface of the printing plate.

7. The 3D printer according to claim 6, further comprising: A plurality of lifting mechanisms connected to the printing plate bracket to adjust the position of the printing plane in the Z-axis direction of the 3D printer, wherein the printing plane is perpendicular to the Z-axis direction of the 3D printer; and A processor for controlling the printing operation of the 3D printer, wherein the processor is further configured to control the plurality of lifting mechanisms according to the determined position of the printing plane in the Z-axis direction to achieve leveling of the printing plane.

8. The 3D printer according to claim 5, wherein, The printing platform further includes: A printing plate providing the printing plane; and A printing plate bracket supporting the printing plate, Wherein at least one of the at least three flexible cantilever structures is mounted below the printing plate bracket, and Wherein, the body of the at least one flexible cantilever structure is connected to the lower surface of the printing flat plate bracket.

9. The 3D printer according to claim 8 further includes a plurality of lifting mechanisms, at least one of the plurality of lifting mechanisms being respectively connected to a first cantilever of at least one of the at least three flexible cantilever structures to adjust the position of the printing plane in the Z-axis direction of the 3D printer, wherein, The printing plane is perpendicular to the Z-axis direction of the 3D printer.

10. The 3D printer according to any one of claims 6-9, Among them, The printing flat plate is a rectangular flat plate, and Wherein, the first flexible cantilever structure, the second flexible cantilever structure and the third flexible cantilever structure among the at least three flexible cantilever structures are respectively arranged corresponding to three different edges of the rectangular flat plate, or the first flexible cantilever structure and the second flexible cantilever structure are arranged corresponding to one edge of the rectangular flat plate and the third flexible cantilever structure is arranged corresponding to another edge of the rectangular flat plate.

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