阅读说明：本技术 一种适于太空环境的光固化3d打印设备和打印方法 (Photocuring 3D printing equipment and printing method suitable for space environment ) 是由 赵雨 孙伟 徐圆圆 于 2020-05-14 设计创作，主要内容包括：本发明实施例涉及一种适于太空环境的光固化3D打印设备和打印方法,所述3D打印设备包括驱动部件、连接件、成形底板、成形室和光图案产生装置,所述成形室包括成形室壳体和成形室门,所述成形室门可开合的连接在成形室壳体的开口处,能够与成形室壳体围合形成成形室的容纳空间,所述成形室门为透明材料；所述成形底板设置在成形室的容纳空间内,所述成形底板的成形面与成形室门的内表面相对设置；所述驱动部件通过连接件驱动成形底板靠近或远离成形室门；所述光图案产生装置与成形室门相对的设置在成形室的外侧。本发明实施例通过设计密闭的成形室,克服了失重环境对打印墨水粘度高的要求,使得很多地球上常用的光敏墨水也可以在太空中使用。(The embodiment of the invention relates to a photocuring 3D printing device and a printing method suitable for a space environment, wherein the 3D printing device comprises a driving part, a connecting part, a forming bottom plate, a forming chamber and a light pattern generating device, the forming chamber comprises a forming chamber shell and a forming chamber door, the forming chamber door is connected to the opening of the forming chamber shell in an openable and closable mode and can form a containing space of the forming chamber by enclosing with the forming chamber shell, and the forming chamber door is made of a transparent material; the forming bottom plate is arranged in the accommodating space of the forming chamber, and the forming surface of the forming bottom plate is arranged opposite to the inner surface of the forming chamber door; the driving part drives the forming bottom plate to be close to or far away from the forming chamber door through the connecting piece; the light pattern generating device is disposed outside the forming chamber opposite to the forming chamber door. According to the embodiment of the invention, the requirement of a weightless environment on high viscosity of printing ink is overcome by designing the closed forming chamber, so that a plurality of photosensitive inks commonly used on the earth can be used in space.)

1. A photocuring 3D printing device suitable for a space environment, characterized in that the 3D printing device comprises a driving part (100), a connector (200), a forming bottom plate (400), a forming chamber (600) and a light pattern generating device (700),

the forming chamber (600) comprises a forming chamber shell (40) and a forming chamber door (30), the forming chamber door (30) is connected to the opening of the forming chamber shell (40) in an openable and closable mode and can form a containing space of the forming chamber (600) by enclosing with the forming chamber shell (40), and the forming chamber door (30) is made of transparent materials;

the forming bottom plate (400) is arranged in the accommodating space of the forming chamber (600), and the forming surface of the forming bottom plate (400) is arranged opposite to the inner surface of the forming chamber door (30);

the driving part (100) drives the forming bottom plate (400) to be close to or far away from the forming chamber door (30) through the connecting piece (200);

the light pattern generating device (700) is disposed outside the forming chamber (600) opposite to the forming chamber door (30).

2. The photocuring 3D printing device of claim 1, wherein: the forming chamber shell (40) is a hollow cuboid or cylinder with one end integrally opened; the forming chamber door (30) is correspondingly square or round, and is arranged at the open end of the forming chamber shell (40) in an openable and closable manner.

3. The photocuring 3D printing device of claim 1, wherein: the forming surface of the forming bottom plate (400) and the inner surface of the forming chamber door (30) are flat surfaces, and the area of the forming surface of the forming bottom plate (400) is smaller than that of the inner surface of the forming chamber door (30).

4. The photocuring 3D printing device of claim 1, wherein: the driving part (100) is arranged outside the forming chamber (600), the connecting piece (200) passes through the forming chamber shell (40) after passing through a sealing piece (300) arranged on the forming chamber shell (40) and enters the forming chamber (600), and two ends of the connecting piece (200) are respectively connected with the driving part (100) and the forming bottom plate (400).

5. The photocuring 3D printing device of claim 4, wherein: the connecting piece (200) is detachably connected with the forming bottom plate (400).

6. The photocuring 3D printing device of claim 1, wherein: the forming bottom plate (400) is opposite to be close to or far from the forming chamber door (30).

7. The photocuring 3D printing device of claim 1, wherein: the forming chamber shell (40) is provided with an exhaust port (10) connected with an external exhaust device and/or a liquid supplementing port (20) connected with a liquid supplementing device.

8. A photocuring 3D printing method suitable for a space environment, characterized in that photocuring 3D printing is carried out by using the photocuring 3D printing device according to any one of claims 1 to 7.

9. The photocuring 3D printing method of claim 8, wherein the photocuring 3D printing method comprises the steps of:

step S1, injecting photosensitive ink into a forming chamber (600) of the photocuring 3D printing equipment;

step S2, driving a forming bottom plate (400) to be close to a forming chamber door (30) by a driving part (100) of the photocuring 3D printing device, enabling the distance between a forming surface of the forming bottom plate (400) and the inner surface of the forming chamber door (30) to be a layer height distance of a 3D printing solid model to be printed, and enabling photosensitive ink to be kept between the forming surface of the forming bottom plate (400) and the inner surface of the forming chamber door (30);

step S3, the light pattern generating device (700) of the light-cured 3D printing equipment projects the picture patterns of the corresponding layers of the 3D printing solid model towards the forming chamber door (30), so that the photosensitive ink between the forming surface of the forming bottom plate (400) and the inner surface of the forming chamber door (30) is cured into a solid layer under the irradiation of light, and the solid layer is formed newly;

step S4, the driving part (100) of the photocuring 3D printing device drives the forming bottom plate (400) to be far away from the forming chamber door (30) by the distance of the one layer height, so that the photosensitive ink of the one layer height is kept between the newly formed solid layer and the forming surface of the forming bottom plate (400);

step S5, the photo pattern generating device (700) of the photo-curing 3D printing apparatus projects the picture pattern of the corresponding layer of the 3D printing solid model towards the forming chamber door (30), so that the photosensitive ink between the newly formed solid layer and the forming surface of the forming base plate (400) is cured into a new solid layer as the newly formed solid layer under the irradiation of light,

steps S4 and S5 are repeated until printing of the 3D printed solid model is completed.

10. The photocuring 3D printing method of claim 9, wherein a layer height of the 3D printed solid model to be printed is 10-100 microns.

11. The photocuring 3D printing method of claim 9, wherein the forming floor (400) is plasma cleaned and hydrophilically treated prior to injecting photosensitive ink into a forming chamber (600) of a photocuring 3D printing device.

12. The photocuring 3D printing method according to claim 9, wherein the photosensitive ink comprises gelatin-methacrylic acid and normal saline, the gelatin-methacrylic acid is dissolved in the normal saline, the mass-to-volume ratio of the gelatin-methacrylic acid is 1 to 10%, and the mass-to-volume ratio of the gelatin-methacrylic acid (GelMA) is the ratio of the mass of the gelatin-methacrylic acid (GelMA) to the total volume of the photosensitive ink at normal temperature, and the unit is g/ml; alternatively, the first and second electrodes may be,

the photosensitive ink comprises poly (ethylene glycol) diacrylate and deionized water, the poly (ethylene glycol) diacrylate is dissolved in the deionized water, the mass-volume ratio of the poly (ethylene glycol) diacrylate is 5-30%, the mass-volume ratio of the poly (ethylene glycol) diacrylate refers to the ratio of the mass of the poly (ethylene glycol) diacrylate to the total volume of the photosensitive ink at normal temperature, and the unit is g/ml.

13. The photocuring 3D printing method of claim 12, wherein the photosensitive ink further contains cells, wherein the density of the cells is 10⁴Per ml to 10⁸One per ml.

14. The photocuring 3D printing method of claim 9, further comprising: and after the 3D printing solid model is printed, disconnecting the connecting piece (200) from the forming bottom plate (400), taking out the forming bottom plate (400) adhered with the 3D printing solid model from the forming chamber (600), and washing off the residual photosensitive ink on the surface of the 3D printing solid model by using a cleaning agent.

Technical Field

The invention belongs to the technical field of 3D printing, and particularly relates to photocuring 3D printing equipment and a printing method suitable for a space environment.

Background

With the advent of the 21 st century, the pace at which mankind explores space has been increasingly accelerated, but the cost of transporting parts to space has been extremely expensive. If in space station or space ship, according to follow-up use needs, use 3D printer printing required part or article, will effectual reduction space experiment and cost of maintenance.

However, the space environment is different from the earth, and due to the influence of the space weightless environment, the traditional photocuring 3D printing method is difficult to accurately print the originally designed shape in the space, and the problems of poor adhesion of printing ink, layer-by-layer peeling or falling off and the like can occur. Particularly, the traditional photocuring 3D printing method cannot be used in a space weightless environment due to the fact that the viscosity of the used material is low and the printing area is not closed.

The existing solution mainly aims to improve the cohesive force between the inks, and the specific method comprises the steps of using magnetic ink and high-viscosity ink.

The magnetic ink is formed by adding a magnetic material into ink, so that the printed ink can be gathered on an instrument by virtue of magnetic attraction without the condition that the ink is not firmly adhered, but the magnetic material is not required by all parts and the use scene is limited.

The high-viscosity ink is that the biological ink has strong viscosity through the addition of specific components, so that the binding force of the biological ink is strong. However, high viscosity inks are very viscous and difficult to print, requiring high jetting forces to jet, and sacrificing printing efficiency and printing time.

Disclosure of Invention

In order to solve the technical problems in material selection and manufacturing processes faced by photocuring 3D printing in space, an embodiment of the invention provides a photocuring 3D printing device suitable for a space environment, which comprises a driving part, a connecting part, a forming bottom plate, a forming chamber and a light pattern generating device,

the forming chamber comprises a forming chamber shell and a forming chamber door, the forming chamber door is connected to the opening of the forming chamber shell in an openable and closable mode and can form a containing space of the forming chamber by enclosing with the forming chamber shell, and the forming chamber door is made of transparent materials;

the forming bottom plate is arranged in the accommodating space of the forming chamber, and the forming surface of the forming bottom plate is arranged opposite to the inner surface of the forming chamber door;

the driving part drives the forming bottom plate to be close to or far away from the forming chamber door through the connecting piece;

the light pattern generating device is disposed outside the forming chamber opposite to the forming chamber door.

Further, the forming chamber shell is a hollow cuboid or cylinder with one end integrally opened; the forming chamber door is correspondingly square or round and is arranged at the open end of the forming chamber shell in an openable and closable manner.

Further, the forming surface of the forming bottom plate and the inner surface of the forming chamber door are flat surfaces, and the area of the forming surface of the forming bottom plate is smaller than that of the inner surface of the forming chamber door.

Further, the driving part is arranged outside the forming chamber, the connecting piece passes through the forming chamber shell after passing through a sealing piece arranged on the forming chamber shell and then enters the forming chamber, and two ends of the connecting piece are respectively connected with the driving part and the forming bottom plate.

Further, the connecting piece is detachably connected with the forming bottom plate.

Further, the forming bottom plate is opposite to be close to or far from the forming chamber door.

Further, the forming chamber shell is provided with an exhaust port connected with an external exhaust device and/or a liquid supplementing port connected with a liquid supplementing device.

The embodiment of the invention also provides a photocuring 3D printing method suitable for the space environment, and photocuring 3D printing is carried out by using the photocuring 3D printing equipment.

Further, the photocuring 3D printing method comprises the following steps:

step S1, injecting photosensitive ink into a forming chamber of the photocuring 3D printing equipment;

step S2, driving the forming bottom plate to be close to the forming chamber door by a driving part of the photocuring 3D printing device, enabling the distance between the forming surface of the forming bottom plate and the inner surface of the forming chamber door to be a layer height distance of the 3D printing solid model to be printed, and keeping photosensitive ink between the forming surface of the forming bottom plate and the inner surface of the forming chamber door;

step S3, the photo pattern generating device of the photo-curing 3D printing device projects the picture pattern of the corresponding layer of the 3D printing solid model towards the forming chamber door, so that the photosensitive ink between the forming surface of the forming bottom plate and the inner surface of the forming chamber door is cured into a solid layer under the irradiation of light, and the solid layer is formed newly;

step S4, driving a forming bottom plate to be far away from a forming chamber door by the distance of the one layer height by a driving part of the photocuring 3D printing device, so that photosensitive ink of the one layer height is kept between a newly formed solid layer and a forming surface of the forming bottom plate;

step S5, the photo pattern generating device of the photo-curing 3D printing apparatus projects the picture pattern of the corresponding layer of the 3D printed solid model towards the forming chamber door, so that the photosensitive ink between the newly formed solid layer and the forming surface of the forming base plate is cured into a new solid layer as the newly formed solid layer under irradiation of light,

steps S4 and S5 are repeated until printing of the 3D printed solid model is completed.

Further, the distance of one layer height of the 3D printing solid model to be printed is 10-100 micrometers.

Further, before photosensitive ink is injected into a forming chamber of the photocuring 3D printing device, plasma cleaning and hydrophilic treatment are carried out on the forming bottom plate.

Further, the photosensitive ink comprises gelatin-methacrylic acid and normal saline, the gelatin-methacrylic acid is dissolved in the normal saline, the mass volume ratio of the gelatin-methacrylic acid is 1-10%, the mass volume ratio of the gelatin-methacrylic acid (GelMA) refers to the ratio of the mass of the gelatin-methacrylic acid (GelMA) to the total volume of the photosensitive ink at normal temperature, and the unit is g/ml; alternatively, the first and second electrodes may be,

the photosensitive ink comprises poly (ethylene glycol) diacrylate and deionized water, the poly (ethylene glycol) diacrylate is dissolved in the deionized water, the mass-volume ratio of the poly (ethylene glycol) diacrylate is 5-30%, the mass-volume ratio of the poly (ethylene glycol) diacrylate refers to the ratio of the mass of the poly (ethylene glycol) diacrylate to the total volume of the photosensitive ink at normal temperature, and the unit is g/ml.

Further, the photosensitive ink also contains cells, wherein the density of the cells is 10⁴Per ml to 10⁸One per ml.

Further, the photocuring 3D printing method further includes: and after the 3D printing solid model is printed, disconnecting the connecting piece from the forming bottom plate, taking out the forming bottom plate adhered with the 3D printing solid model from the forming chamber, and washing off the residual photosensitive ink on the surface of the 3D printing solid model by using a cleaning agent.

The invention has the beneficial effects that: according to the photo-curing 3D printing equipment and the printing method suitable for the space environment, which are provided by the embodiment of the invention, the requirement of a weightless environment on high viscosity of printing ink is overcome by designing the closed forming chamber, so that a plurality of photosensitive inks commonly used on the earth can be used in space. On the other hand, the low-viscosity bio-ink (gelatin-methacrylic acid (GelMA)) used in the embodiment of the invention is a bio-ink with very friendly biological activity, and space printing of the material can be realized by the method of the embodiment of the invention, so that more low-viscosity ink choices are provided for development of space photo-curing 3D printing experiments.

Drawings

Fig. 1 is a structural diagram of a photocuring 3D printing device suitable for a space environment according to an embodiment of the present invention;

FIG. 2 is a block diagram of a forming chamber of a photocuring 3D printing device suitable for a space environment according to an embodiment of the invention;

fig. 3 is a flowchart of a photocuring 3D printing method suitable for a space environment according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. Those skilled in the art will appreciate that the present invention is not limited to the drawings and the following examples.

As used herein, the term "include" and its various variants are to be understood as open-ended terms, which mean "including, but not limited to. The terms "upper", "lower" and the like are used only to indicate a positional relationship between relative objects. The terms "first", "second" and the like are used merely to indicate different technical features and have no essential meaning.

According to one aspect of the invention, a photocuring 3D printing device suitable for a space environment is provided, as shown in fig. 1 and 2. The 3D printing apparatus includes a driving part 100, a connector 200, a forming base 400, a forming chamber 600, and a light pattern generating device 700.

Specifically, the forming chamber 600 includes a forming chamber housing 40 and a forming chamber door 30, and the forming chamber door 30 is openably and closably connected to an opening of the forming chamber housing 40 and can form a receiving space of the forming chamber 600 by enclosing with the forming chamber housing 30. The shaping chamber door 30 is a transparent material, and may be a colorless transparent plastic or a colorless transparent glass, preferably a hydrophobic treated high light transmittance glass. In the embodiment of the present invention, the forming chamber housing 40 is a hollow rectangular parallelepiped or cylinder with one end opened integrally, as shown in fig. 1, the forming chamber door 30 is square or circular and is openably and closably disposed at the open end of the forming chamber housing 40. The forming chamber shell 40 is made of transparent plastic or transparent glass so as to facilitate the observation of the printing condition of an operator, and is preferably made of tawny acrylic plastic so as to prevent strong light from damaging human eyes.

The forming base plate 400 is disposed in the receiving space of the forming chamber 600, the forming surface of the forming base plate 400 is disposed opposite to the inner surface of the forming chamber door 30, and the forming surface of the forming base plate 400 and the forming chamber door 30 are preferably flat. The forming surface of the forming base 400 has an area smaller than that of the inner surface of the forming chamber door 30. When the forming chamber housing 40 is a hollow rectangular parallelepiped or cylinder having one end integrally opened, the forming surface of the forming base 400 has an area smaller than the sectional area of the hollow rectangular parallelepiped or cylinder. Preferably, the molding surface of the molding base 400 has an area 1/3 to 4/5 of the inner surface area of the molding chamber door 30.

The driving part 100 drives the forming base 400 to approach or separate from the forming chamber door 30 through the connection member 200. In this embodiment, the driving member 100 is disposed outside the forming chamber 600, the connection member 200 passes through the forming chamber housing 40 after passing through the sealing member 300 disposed on the forming chamber housing 40, and enters the forming chamber 600, both ends of the connection member 200 are respectively connected to the driving member 100 and the forming base plate 400, and the connection member 200 is detachably connected to the forming base plate 400. The driving part 100 can drive the connecting member 200 to slide back and forth in a manner of closely adhering to the sealing member 300, thereby bringing the forming base plate 400 close to or away from the forming chamber door 30. Preferably, the forming base 400 faces (direction Z in fig. 1) toward or away from the forming chamber door 30. Meanwhile, due to the existence of the sealing member 300, the connecting member 200 is tightly attached to the sealing member 300, and the liquid in the forming chamber 600 can be sealed by the attachment of the connecting member 200 to the sealing member 300 during the static and sliding processes. It will be understood by those skilled in the art that the driving part 100 may be disposed outside the forming chamber 600.

The light pattern generating device 700 is disposed at the outside of the forming chamber 600 opposite to the forming chamber door 30. The light pattern generating device 700 may be a laser spot scanning type light pattern generating device, a projection type light pattern generating device, or an LCD screen transformation pattern type light pattern generating device, and is preferably a projection type light pattern generating device. The effective luminous power of the light pattern generating device 700 irradiated to the bottom of the forming chamber 600 is 0-100 mW/cm²Preferably 1-20 mW/cm²。

As shown in fig. 2, the forming chamber housing 40 is further provided with an exhaust port 10 and a fluid infusion port 20. The exhaust port 10 is connected to an external exhaust means for removing excessive bubbles generated in the forming chamber 600 due to the addition of the printing photosensitive ink. The fluid replenishment port 20 may be connected to a fluid replenishment device for replenishing the photosensitive ink into the forming chamber 600.

In addition, the forming chamber 600 further has a temperature control device (not shown) for controlling the temperature in a range of 0 to 80 ℃, preferably 10 to 40 ℃.

The 3D printing apparatus further includes a fixing mount 500, the forming chamber 600 may be detachably coupled to the fixing mount 500, and the fixing mount 500 may fix the 3D printing apparatus at a corresponding working position.

According to the photo-curing 3D printing equipment suitable for the space environment, the closed forming chamber is designed, the requirement of a weightless environment on high viscosity of printing ink is overcome, and a plurality of photosensitive inks commonly used on the earth can be used in the space.

According to another aspect of the present invention, there is provided a photocuring 3D printing method suitable for a space environment, using the photocuring 3D printing apparatus as described above, the photocuring 3D printing method being as shown in fig. 3, and including the following steps:

step S1, filling the photo-sensitive ink into the forming chamber 600 of the photo-curing 3D printing apparatus, and closing the forming chamber door 30.

Specifically, the molding chamber door 30 of the molding chamber 600 is opened, and the photosensitive ink is injected into the molding chamber 600 through the opening of the molding chamber housing 40, or the photosensitive ink may be injected into the molding chamber 600 through the liquid supply port 20 of the molding chamber housing 40.

Further, it is preferable that the forming substrate 400 is subjected to plasma cleaning and hydrophilic treatment before injecting photosensitive ink into the forming chamber 600 of the photo-curing 3D printing apparatus in order to ensure cleanliness and hydrophilicity of the forming substrate 400.

When the photosensitive ink is added to the molding chamber 600, excessive air bubbles generated by the addition of the photosensitive ink in the molding chamber 600 are discharged through the exhaust port 10.

The photosensitive ink includes one or more of a biomaterial or a non-biomaterial, for example, including one or more of gelatin-methacrylic acid (GelMA), polyethylene glycol acrylate (PEGDA), hyaluronic acid-methacrylic acid (HAMA), collagen-methacrylic acid (coloma), and a photosensitive resin. Since the bio-ink including gelatin-methacrylic acid (GelMA) is a low viscosity bio-ink, the bio-activity is very friendly, and it is a preferred material for photo-curing 3D printing in a space environment.

In a preferred embodiment of the present invention, the photosensitive ink comprises gelatin-methacrylic acid (GelMA) and physiological saline, and a certain mass of gelatin-methacrylic acid (GelMA) powder is dissolved in the physiological saline to prepare the photosensitive ink. Wherein the mass volume ratio of the gelatin to the methacrylic acid (GelMA) is 1-10%, preferably 3-5%. The mass-volume ratio of the gelatin to the methacrylic acid (GelMA) refers to the ratio of the mass of the gelatin to the methacrylic acid (GelMA) to the total volume of the photosensitive ink at normal temperature, and the unit is g/ml.

The photosensitive ink may also include one or more of gelatin, other gelatin derivatives, alginate derivatives, agar, matrigel, collagen, polysaccharides, hyaluronic acid, chitosan, layer-connecting proteins, fibronectin, and fibrin.

The photosensitive ink may further contain cells, wherein the density of the cells is 10⁴Per ml to 10⁸One/ml, preferably 10⁵Per ml to 10⁷One/ml, more preferably 10⁶One per ml.

Step S2, the driving part 100 of the light-curing 3D printing apparatus drives the forming base plate 400 to approach the forming chamber door 30, so that the distance between the forming surface of the forming base plate 400 and the inner surface of the forming chamber door 30 is 10-100 μm, and a layer of photosensitive ink of the 3D printing solid model to be printed is kept between the forming surface of the forming base plate 400 and the inner surface of the forming chamber door 30.

At this time, photosensitive ink with a thickness of 10 to 100 micrometers exists between the forming surface of the forming base plate 400 and the inner surface of the forming chamber door 30, the thickness of 10 to 100 micrometers is the layer height of the 3D printing solid model, and the 3D printing solid model is formed by overlapping a plurality of layers.

Step S3, the light pattern generating device 700 of the light-cured 3D printing apparatus projects the picture pattern of the corresponding layer of the 3D printing solid model towards the forming chamber door 30 for 3-30S, so that the photosensitive ink between the forming surface of the forming base plate 400 and the inner surface of the forming chamber door 30 is cured into a solid layer under the irradiation of light as a newly formed solid layer.

And obtaining picture patterns of corresponding layers of the 3D printing entity model according to the computer 3D model, wherein the computer 3D model can be in an STL or picture format.

Step S4, the driving part 100 of the photocuring 3D printing device drives the forming base plate 400 to be far away from the forming chamber door 30 by the distance (10-100 micrometers) of the height of one layer, so that the photosensitive ink of the height of one layer is kept between the newly formed solid layer and the forming surface of the forming base plate 400.

Step S5, the photo pattern generating device 700 of the photo-curing 3D printing apparatus projects the picture patterns of the corresponding layers of the 3D printing solid model towards the forming chamber door 30 for 3-30S, so that the photosensitive ink between the newly formed solid layer and the forming surface of the forming base plate 400 is cured into a new solid layer as the newly formed solid layer under the irradiation of light.

Steps S4 and S5 are repeated until printing of the 3D printed solid model is completed.

And step S6, taking out the printed 3D printing solid model from the forming chamber 600 of the photocuring 3D printing device.

Specifically, the connection between the connector 200 and the forming base plate 400 is disconnected, the forming chamber door 30 of the forming chamber 600 is opened, for example, tweezers are used to take the forming base plate 400 adhered with the 3D printing solid model out of the forming chamber 600, and the cleaning agent is used to wash off the residual photosensitive ink on the surface of the 3D printing solid model.

In the process of printing the 3D printing solid model, the photosensitive ink is replenished into the forming chamber 600 through the liquid replenishing port 20, so that the forming chamber 600 is always filled with the photosensitive ink.

The present invention is further illustrated by the following preferred embodiments, and it will be understood by those skilled in the art that the present invention may be embodied in various forms and should not be construed as limited by the following embodiments. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.