WO2020228422A1

WO2020228422A1 - Ink-jet control circuit and 3d printing device

Info

Publication number: WO2020228422A1
Application number: PCT/CN2020/081212
Authority: WO
Inventors: 俞萍初
Original assignee: 珠海赛纳三维科技有限公司
Priority date: 2019-05-16
Filing date: 2020-03-25
Publication date: 2020-11-19
Also published as: CN210100725U

Abstract

Disclosed are an ink-jet control circuit for a 3D printing device, and a 3D printing device. The ink-jet control circuit comprises a positioning module, a control module, a row counting module, a storage module, and a data carrying module, wherein the positioning module is used for acquiring position data of a nozzle; the control module is used for generating a row synchronization signal and an ink-jet enabling signal according to the position data of the nozzle; the row counting module is used for generating a row counting value according to the row synchronization signal and the ink-jet enabling signal; the storage module is used for storing printing data; and the data carrying module is used for generating non-printing data, and is used for sending the printing data or the non-printing data to the nozzle according to the row counting value, so as to control the nozzle to jet ink droplets. The control module of the present application only needs to process the printing data rather than the non-printing data, such that the amount of data processed by the control module is effectively reduced, reducing the load of the control module and thus improving data processing efficiency of the control module.

Description

Inkjet control circuit and 3D printing equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201920707017.9, and the invention title is "Inkjet Control Circuit and 3D Printing Equipment" on May 16, 2019, the entire content of which is incorporated into this application by reference in.

Technical field

This application relates to the technical field of 3D printing equipment, and in particular to an inkjet control circuit for 3D printing equipment and a 3D printing equipment with the inkjet control circuit.

Background technique

When the inkjet printing device is printing, it is necessary to control the nozzles by sending data on the walking path of the nozzles, so that the nozzles eject ink droplets or not eject ink droplets. During this process, the print area (image data Part) is only a part of the path, and the other part is a non-printing area (background or other part), and the data in this non-printing area still needs to be processed by the CPU, which reduces the processing speed of the CPU.

Application content

In order to overcome the above-mentioned problems in the prior art, the main purpose of this application is to provide an inkjet control circuit for a 3D printing device that can increase the processing speed of the CPU.

In order to achieve the above objectives, this application specifically adopts the following technical solutions:

This application provides an inkjet control circuit for a 3D printing device. The 3D printing device includes a nozzle, and the inkjet control circuit includes:

The positioning module is used to obtain position data of the spray head.

A control module, which is connected to the positioning module and is used to generate a line synchronization signal and an ink jet enable signal according to the position data of the nozzle.

A line counting module, the line counting module is connected to the positioning module, and is configured to generate a line count value according to the line synchronization signal and the ink jet enable signal.

The storage module is used to store printing data.

At least one data handling module, the data handling module is respectively connected to the row counting module, the storage module and the nozzle, and the data handling module is used to generate non-printing data and is used to generate non-printing data according to the row count value, The printing data or the non-printing data is transmitted to the nozzle to control the nozzle to eject ink droplets.

Preferably, the data transport module includes a data transmission module, a data buffer module, a fixed value data generation module, a data transmission module, a selector, and a channel interval module.

The channel section module is connected to the row counting module and the control module respectively.

The data transmission module is respectively connected to the storage module and the data buffer module, and the selector is connected to the channel section module, the data buffer module, the fixed value data generation module, and the data transmission module, respectively Connected, the data sending module is connected with the spray head.

Preferably, the data transport module further includes an AND gate, and the data sending module and the channel section module are connected to the data buffer module via the AND gate.

Preferably, the positioning module includes a grating, a magnetic grid or a motor.

Preferably, the data buffer module is a FIFO storage module.

Preferably, the nozzle has a printing channel, and the number of the data carrying modules is correspondingly equal to the number of the printing channel.

Correspondingly, the present application also provides a 3D printing device, which includes a support platform, a nozzle, a circuit board, and the above-mentioned inkjet control circuit; the inkjet control circuit is arranged on the circuit board, and the circuit The plate is connected with the nozzle and is used for controlling the nozzle to eject ink droplets to the supporting platform to form a printing layer.

Preferably, the 3D printing device further includes a curing module for curing the printing layer.

Preferably, the 3D printing device further includes a leveling module for leveling the printing layer.

Preferably, the 3D printing device further includes a slicing module for slicing the object to be printed to generate printing data.

Compared with the prior art, this application processes the print data through the control module and stores it in the storage module, generates non-print data through the data transfer module, and then the data transfer module selects whether to print data or print data according to the row count value generated by the interval module. The non-printing data is sent to the nozzle to control the nozzle to eject ink droplets, so that the control module only needs to process the printing data without processing the non-printing data, which effectively reduces the data processing volume of the control module and reduces the burden on the control module , Thereby improving the data processing efficiency of the control module.

Description of the drawings

FIG. 1 is a schematic structural diagram of an inkjet control circuit according to an embodiment of the application.

Fig. 2 is a schematic diagram of a specific circuit structure of the data transport module in Fig. 1.

FIG. 3 is a schematic structural diagram of a multi-channel control circuit according to an embodiment of the application.

FIG. 4 is a schematic diagram of the relationship among the line synchronization signal, the ink jet enable signal, and the channel synchronization signal of the application embodiment.

FIG. 5 is a schematic structural diagram of a 3D printing device according to another embodiment of the application.

Picture ID:

1- Nozzle;

2- Support platform;

3-circuit board;

4- curing module;

5-leveling module;

6-Print the object.

Detailed ways

In order to make the purpose, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and are not used to limit the application.

In the description of this application, unless expressly stipulated and limited otherwise, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated The term "multiple" refers to two or more; the terms "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral Connection, or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

The printing process of 3D printing equipment is usually that the central control module (CPU) processes the data and stores the data in the storage module. When the printing work is performed, the data in the storage module is read, based on the data and the print head The movement executes printing. Generally, the movement of the nozzle includes main scanning movement (also called X-axis movement) and sub-scanning movement (also called Y-axis movement). In the main scanning movement, the nozzle performs printing work according to the data. In the sub-scanning movement, Without data transfer, the print head does not work; correspondingly, the data is processed by the CPU into multiple lines of data, and each line data represents the printing work performed by the print head in one main scanning movement.

It is worth noting that:

The nozzle described in this application is a nozzle with multiple printing channels, or a combination of multiple nozzles with a single channel, or a combination of the foregoing.

The channel mentioned in the present application refers to a printing channel, which is an arrangement formed by a plurality of nozzles on the nozzle, and a row of nozzles represents a printing channel.

The line printing interval mentioned in the present application is a data interval before and after the print head controls whether the print head ejects ink droplets through data during a traveling process.

The channel printing interval described in the present application is a data interval before and after the channel of the nozzle uses data to control whether the nozzle ejects ink droplets during a traveling process. Different channels in the nozzle have different channel printing intervals.

When the nozzle is moving in the main scan, the ejection of the nozzle is controlled by binary data. For example, 0 data means that the nozzle does not eject ink drops, 1 data means that the nozzle ejects ink drops, or 0 data means that the nozzle ejects ink drops, 1 data Indicates that the nozzle does not eject ink droplets. The binarized data is processed by the CPU, and usually includes data on whether the nozzle is ejected or not in the entire main scanning movement, and the data interval of different channels of the nozzle is the same, and the specific ejection interval is different.

As shown in Fig. 4, the data interval S of whether the nozzle ejects or not in a main scanning movement of the nozzle. The data interval S includes a line printing interval and a line non-printing interval. Among them, S1 shown in Fig. 4 is a line printing interval. S2 and S3 are line non-printing intervals.

Continuing to refer to Figure 4, in the line printing interval S1 of the nozzle, the channel printing interval of the first channel of the nozzle during a main scanning movement is also S1. In the first channel, the first channel printing interval is shown in the figure S11, the non-printing interval of the first channel is S12 and S13 as shown in the figure. Similarly, the second channel printing interval is S21, the second channel non-printing interval is S22, S23, the third channel printing interval is S31, the third channel non-printing interval is S32, S33, and the fourth channel printing interval is S41, The four-pass non-printing interval is S42 and S43. Normally, the print data of the channel printing sections S11, S21, S31, S41 and the non-printing data of the channel non-printing sections S12, S13, S22, S23, S32, S33, S42, S43 are processed by the CPU, and the print data is combined with The non-printing data is stored in the storage module. During printing, the printing data and non-printing data corresponding to the nozzle channel are obtained and sent to the channel, and the nozzle ejection or not is controlled according to the printing data and non-printing data.

Since the non-printing data is only for controlling the nozzles not to perform ejection, it is meaningless for the printing work. When the number of nozzles or the number of nozzle channels is large, the non-printing data is in the total data composed of non-printing data and printing data. The account is relatively large, which actually increases the data processing volume of the CPU, increases the burden on the CPU, and indirectly reduces the processing capacity of the CPU. In addition, the non-printing data also occupies the storage module space, resulting in a waste of storage resources. When transmitting data, since the data during transmission includes printing data and non-printing data, the bandwidth requirement on the communication port is also increased.

Example 1

As shown in Figure 1, this application discloses an inkjet control circuit for a 3D printing device. The 3D printing device includes a nozzle. The inkjet control circuit includes a positioning module, a control module, a line counting module, a storage module, and at least one Data handling module. The positioning module is used to obtain the position data of the nozzle, and the control module is connected to the positioning module to receive the position data of the nozzle and generate a line synchronization signal and an inkjet enable signal according to the position data of the nozzle. The line counting module is connected to the positioning module and is used to receive the line synchronization signal and the ink jet enable signal and generate the line count value according to the line synchronization signal and the ink jet enable signal. The storage module is connected with the control module and is used to store the printing data processed by the control module. The data handling module is respectively connected with the line counting module, the storage module and the nozzle. The data handling module is used to generate non-printing data and selectively send the printing data or non-printing data to the nozzle to control the nozzle to eject ink droplets.

When the printing device has multiple nozzles, the positions of the nozzles in the main scanning movement direction are different. This difference in position is referred to as phase difference in this application. This application processes the printing data through the control module, but does not process the non-printing data; The storage module stores the print data of multiple print heads instead of storing the non-print data of multiple print heads; the non-print data is generated by the data transfer module, and the data transfer module chooses to send the print data or non-print data to the print heads, effectively reducing The data processing capacity of the control module and the data storage capacity of the storage module are improved, and the processing speed of the control module is improved. At the same time, the amount of data transmitted from the storage module is reduced, and the bandwidth requirement of the communication port is reduced.

As shown in Figure 2, the data handling module includes a data transmission module, a data buffer module, a fixed value data generation module, a data transmission module, a selector, a channel interval module and an AND gate. The data transmission module is respectively connected with the control module and the storage module, and is used to obtain the printing data in the storage module. The data buffer module is connected to the data transmission module and is used for buffering the printing data acquired by the data transmission module. The fixed value data generation module is used to generate non-printing data. The channel interval module is connected to the row count module and the control module respectively, and is used to obtain the row count value from the row count module, and to obtain the interval signal from the control module, and generate the channel synchronization signal according to the row count value and interval signal . The selector is respectively connected to the data buffer module, the fixed value data generation module, the channel section module and the data transmission module, and is used to selectively connect the data buffer module or the fixed value data generation module according to the channel synchronization signal generated by the channel section module to print the data Or non-printing data is sent to the data sending module. The data sending module is connected to the nozzle, and is used to send the print data or non-printing data to the nozzle bit by bit according to the time sequence to control the nozzle to eject ink droplets. The input end of the AND gate is connected to the channel section module and the data sending module respectively, and the output end of the AND gate is connected to the data buffer module. The data buffer module instructs the data transmission module whether to transmit new print data. The AND gate is a switch for reading signals , When the channel synchronization signal output by the channel section module is in the enabled state, the data read signal of the data transmission module is transmitted to the data buffer module through the AND gate, and the print data of the data buffer module is sent to the data transmission module through the selector. The selector selects the print data of the data cache module.

Among them, the data transmission module is a DMA (Direct Memory Access) module, and the printing data transmission is completed by the DMA module instead of the control module, which reduces the burden of the control module. The data buffer module is a FIFO (First Input First Output, first-in first-out queue) storage module, which has a small storage capacity and stores and transmits print data in order, with a simple and efficient processing method. The control module is a central control module (CPU, Central Processing Unit). The positioning module is a grating, magnetic grid or motor, etc.

In specific implementation, when the nozzle is moving, the positioning module is used to read the position data of the nozzle. The control module obtains the position data of the print head from the positioning module, determines that the position of the print head is in the printing interval or the non-printing interval, and generates the line synchronization signal and the inkjet enable signal. At the same time, the control module sends the line synchronization signal and the inkjet enable signal to Line counting module and data sending module. After the line counting module obtains the line synchronization signal and the inkjet enable signal, it counts the inkjet enable signal when the line synchronization signal is enabled, and uses the counter module, the line synchronization signal and the inkjet enable signal to control the ejection of the line printing interval. The number of inks is counted, the line count value is generated, and sent to the channel interval module, and the count is cleared when the line synchronization signal fails. The channel interval module obtains the row count value from the row count module, and the control module initializes the enable interval. This interval is compared with the same row count value to generate an effective channel synchronization signal and send it to the selector and AND gate. After the selector receives the channel synchronization signal of the channel interval module, it selects the connected data buffer module or the fixed value data generation module according to the channel synchronization signal. When the channel synchronization signal is the channel printing interval, the selector connects to the data buffer module, and the data sending module sends the print data buffered in the data buffer module to the nozzle so that the nozzle ejects ink droplets; when the channel synchronization signal is a non-printing interval , The selector is connected to the fixed value data generating module, and the data sending module sends the non-printing data generated by the fixed value data generating module to the nozzle so that the nozzle does not eject ink droplets.

For example, if the line count value generated by the line count module is n, and the interval signal generated by the control module is [3, m], n and m are integers and n>m, then the channel printing interval is the inkjet enable signal The interval formed by the 3rd high level to the mth high level. In this application, the line counting module is set as a counter to count the number of high-level signals of the inkjet enable signal to form a line count value. The interval signal generated by the control module indicates the range of the high level signal in the row count value. For example, if the row count value is 100, the interval signal sent by the control module to the first channel indicates that the range 3-50 is high, corresponding to S11 shown in Figure 4, and the remaining 1-2 and 51-100 are low. Corresponding to S12 and S13 shown in FIG. 4, S21 of the second channel, S31 of the third channel, and S41 of the fourth channel are similar.

The data buffer module of the present application is used to buffer the print data obtained by the data transmission module from the storage module. Because the transmission speed of the print data is much greater than the jetting speed of the print head to execute the data, the two speeds are required to be consistent during printing. , The data buffer module is required to buffer the print data and send it to the print head.

In this application, the channel section module and the data sending module are connected to the data buffer module through an AND gate, the control module sends the line synchronization signal and the inkjet enable signal to the data transmission module, and the line synchronization signal and the inkjet enable signal indicate data The sending module generates the print data reading signal and sends it to the AND gate, and the channel interval module sends the generated channel synchronization signal to the AND gate. When the position of the print head is in the channel printing interval, the data reading signal of the data sending module passes through the AND gate. The data buffer module is sent to the data buffer module, the AND gate is opened, the data buffer module starts the print data transmission of the channel, and the selector selectively connects the data buffer module according to the channel synchronization signal to transmit the print data to the print head. The data reading signal is composed of a series of pulse signals, and the pulse signal instructs the data buffer module to transmit quantitative printing data each time. When the storage space in the data buffer module is blank due to data transmission, the data buffer module instructs the data transmission module to extract quantitative printing data from the storage module and store it in the data buffer module. When the position of the print head is in the non-printing section of the channel, the AND gate is closed, and the selector is selectively connected to the fixed value data generation module according to the channel synchronization signal to transmit non-printing data to the print head.

For example, the storage space of the data buffer module is 256b, which stores the 256b print data obtained from the storage module through the data transmission module. When the channel synchronization signal is enabled, the selector connects to the data buffer module, and the line synchronization signal and When the inkjet enable signal is enabled, the data sending module sends a data read signal to the AND gate, and the AND gate is opened when the channel synchronization signal and data read signal are enabled, and the print data in the data buffer module passes through the data sending module The amount of print data transmitted to the print head each time is a preset value, such as 8b; when the storage space in the data buffer module is blank by 128b, the data storage module instructs the data transmission module to transmit the print data and perform a new print Data cache.

In this application, the number of data handling modules corresponds to the number of nozzles or the number of channels of the nozzles. By assigning a data handling module to each channel of the nozzle, the independent transportation of the print data of each channel on the nozzle is realized; each channel The storage capacity of the data cache module in the equipped data handling module can be small, which avoids the need for large non-printing data storage space caused by phase difference. On the other hand, by reducing the storage of non-printing data, the storage space of the control module and the storage space of the storage module can be shared, which reduces the complexity of the circuit.

As shown in Figure 3, in the storage module, the storage module is provided with the first channel data storage space and the second channel data storage space respectively corresponding to the first channel, the second channel, the third channel, and the fourth channel of the nozzle. , The third channel data storage space, the fourth channel data storage space, the first channel data transport module corresponding to the first channel of the print head, under the control of the control module, reads and prints in the first channel data storage space of the storage module The data is sent to the first channel, and the second, third, and fourth channels of the nozzle are the same. For the specific data reading and sending of the first channel data transfer module, the second channel data transfer module, the third channel data transfer module, and the fourth channel data transfer module, refer to the above description, and will not be repeated here.

In this application, the number of channels of nozzles can also be replaced with the number of nozzles, and the realization principle of multiple nozzles is similar to that of multiple channels. In addition, this application does not limit the number of nozzle channels or the number of nozzles, and the above content and shown in FIG. 3 are only examples and do not limit the application.

In this application, after the data transmission of a main scanning movement is completed, the control module instructs the data transmission module to initialize, and at the same time, the positioning module instructs the count in the row counting module to be cleared to prepare for the data acquisition and transmission of the next main scanning movement.

As shown in Figure 4, the high level of the data interval indicates the line printing interval, the low level indicates the line non-printing interval, the high level of the inkjet enable signal indicates inkjet, and the low level indicates no inkjet. The channel synchronization signal The high level of indicates the channel printing interval, and the low level indicates the channel non-printing interval. As shown in Figure 4, S is the data interval of the first channel of the nozzle in a main scanning movement, S1 is the line printing interval described in this embodiment, S2 and S3 are the line non-printing intervals; S11, S21, S31, S41 is the channel printing interval described in this embodiment, corresponding to the first channel printing interval, the second channel printing interval, the third channel printing interval, and the fourth channel printing interval respectively. S12 and S13 are the first channel non-printing interval, S22, S23 is the second pass non-printing interval, S32 and S33 are the third pass non-printing interval, and S42 and S43 are the fourth pass non-printing interval. Based on the foregoing, the line synchronization signal, the ink jet enable signal, and the channel synchronization signal shown in FIG. 4 will be described in conjunction with FIGS.

Taking the first channel as an example, the printing data corresponding to the printing interval S11 of the first channel is processed by the control module and then stored in the storage module; while the non-printing data corresponding to the non-printing intervals S12 and S13 of the first channel is passed through the fixed value data After the generating module is generated, the selector selectively transmits print data or non-print data to the print head according to the line channel synchronization signal.

The printing data corresponding to the printing interval S11 of the first channel is processed by the control module and stored in the storage module. When the synchronization signal of the first channel and the inkjet enable signal meet the high level at the same time, the data buffer module receives the data from the storage module through the data transmission module To obtain the print data in the first channel, the selector selectively connects to the data buffer module according to the high-level first channel section signal, and sends the print data to the print head through the data sending module; and the non-printing section corresponding to the first channel non-printing section S12 and S13 After the data is generated by the fixed value data generating module, when the synchronization signal of the first channel meets the low level, the fixed value data generating module is selectively connected through the selector, and the non-printing data is sent to the print head through the data sending module.

The second channel printing interval S21, the second channel non-printing interval S22, S23, the third channel printing interval 31, the third channel non-printing interval S32, S33, the fourth channel printing interval S41, the fourth channel non-printing interval S42, S43 The same is true for the first-pass printing interval S11 and the first-pass non-printing interval S12, S13, and will not be repeated here.

Example 2

As shown in FIG. 5, the present application discloses a 3D printing device. The 3D printing device includes a nozzle 1, a supporting platform 2, a circuit board 3, and the inkjet control circuit described in Embodiment 1. The inkjet control circuit is arranged at Circuit board 3. The circuit board 3 is connected with the nozzle 1 for controlling the nozzle 1 to eject ink droplets to the supporting platform 2 to form a printing layer.

The 3D printing device also includes a curing module 4 and a leveling module 5, and the curing module 4 is used to cure the printing layer formed on the support platform 2 so that multiple layers are superimposed to form a printing object 6. The leveling module 5 is used for leveling the printing layer before the curing module 4 cures the printing layer formed on the support platform 2.

In this embodiment, when the ink droplets ejected by the nozzle 1 are photosensitive resin materials, the curing module 4 can be a radiation source such as an LED lamp, a xenon lamp, or a laser, and the ink droplets are photocured by radiation to form a cured printing layer; When the ejected ink droplets are temperature-curable materials, the curing module 4 may be a cooling source such as a fan, which solidifies and solidifies the ink droplets by reducing the temperature of the ink droplets to form a cured printing layer.

In this embodiment, when the ink droplet ejected by the nozzle 1 is a temperature-curable material, the leveling module 5 can be heated to melt the ink droplets that are in contact during leveling. The specific implementation may be to embed a heater, Heating source such as resistance wire.

The 3D printing device also includes a slicing module (not shown in the figure). The print data described in Embodiment 1 is generated by the slicing module. Specifically, the slicing module slices the object to be printed at a predetermined distance to generate a bitmap image, and then After analyzing each bitmap image, the print data of each layer is obtained.

The above are only preferred specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or changes within the technical scope disclosed in this application. Replacement shall be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An inkjet control circuit for 3D printing equipment, the 3D printing equipment includes a nozzle, characterized in that the inkjet control circuit includes:

A positioning module, which is used to obtain position data of the spray head;

A control module, which is connected to the positioning module and is used to generate a line synchronization signal and an ink jet enable signal according to the position data of the nozzle;

A line counting module, the line counting module is connected to the positioning module, and configured to generate a line count value according to the line synchronization signal and the ink jet enable signal;

A storage module, the storage module is used to store printing data;

At least one data handling module, the data handling module is respectively connected to the row counting module, the storage module and the nozzle, and the data handling module is used to generate non-printing data and is used to generate non-printing data according to the row count value, The printing data or the non-printing data is transmitted to the nozzle to control the nozzle to eject ink droplets.
The inkjet control circuit according to claim 1, wherein the data transfer module includes a data transmission module, a data buffer module, a fixed value data generation module, a data transmission module, a selector, and a channel interval module;

The channel section module is connected to the row counting module and the control module respectively;

The data transmission module is respectively connected to the storage module and the data buffer module, and the selector is connected to the channel section module, the data buffer module, the fixed value data generation module, and the data transmission module, respectively Connected, the data sending module is connected with the spray head.
3. The inkjet control circuit according to claim 2, wherein the data transport module further comprises an AND gate, and the data sending module and the channel section module are connected to the data buffer module through the AND gate.
The inkjet control circuit according to claim 2, wherein the positioning module comprises a grating, a magnetic grid or a motor.
The inkjet control circuit according to claim 2, wherein the data buffer module is a FIFO storage module.
The inkjet control circuit according to claims 1-5, wherein the nozzle has a printing channel, and the number of the data conveying module corresponds to the number of the printing channel.
A 3D printing device, characterized by comprising a support platform, a nozzle, a circuit board, and the inkjet control circuit according to any one of claims 1-6; the inkjet control circuit is arranged on the circuit board, and the circuit The plate is connected with the nozzle and is used for controlling the nozzle to eject ink droplets to the supporting platform to form a printing layer.
8. The 3D printing device according to claim 7, wherein the 3D printing device further comprises a curing module, and the curing module is used to cure the printing layer.
The 3D printing device according to claim 7, wherein the 3D printing device further comprises a leveling module, and the leveling module is used for leveling the printing layer.
7. The 3D printing device according to claim 7, wherein the 3D printing device further comprises a slicing module, and the slicing module is used to slice the object to be printed to generate printing data.