TWM656853U - 3D Printing Structure - Google Patents

Abstract

A 3D printing structure is made by 3D printing. The 3D printing structure has multiple color layers, some of which have at least one patterned penetration area. The penetration area is hollowed out along a first direction and will not be covered by the color layer located in this direction. The material of the color layer is a ceramic material, the thickness of the color layer is less than 0.1mm, and the color of some color layers is different from the color of other color layers.

Description

3D printed structures

The new type is a 3D printed structure, and in particular a 3D printed structure made by 3D printing technology.

There is a form of art that uses a three-dimensional 3D printing structure to present a two-dimensional pattern, such as Lithophane. Lithophane is carved on a translucent object, and a light source is placed on the back of the lithophane to present the carved image. In the early days, lithophane was made by the artist's delicate hand carving, but now it is made by 3D printing or CNC. However, lithophane can only present the color of the light source, not a variety of colors. In order to present a variety of colors, the ceramic product can be colored after completion.

Traditionally, ceramics are colored by using glaze to paint on the surface of ceramics, and then sintering to obtain colored ceramics. However, for ceramics with fine texture structures, it is very difficult to paint, and the boundaries may not be as precise as expected due to surface tension problems.

Please refer to Figure 1, which shows a human face image, in which the human face 3 is white, and the hair and the background are black. However, if the human face image is made into a delicate ceramic product, such as an object with a diameter of about 25mm, and is presented by a three-dimensional 3D printing structure, some of the fine texture structures on it (such as the dotted line frame in Figure 1) are not easy to color. Moreover, the black glaze can also run onto the human face 3 due to surface tension problems.

Therefore, how to solve the problem of coloring fine texture structures on ceramic products is worth considering by people with general knowledge in this field.

The purpose of this new type is to provide a 3D printing structure that can present a two-dimensional pattern in a three-dimensional way, and the manufacturing process will not produce problems such as fine texture structures being difficult to color and surface tension causing blurred boundaries.

Based on the above purpose and other purposes, the present invention provides a 3D printing structure, which has multiple color layers. Among them, some color layers have at least one patterned penetration area, and the penetration area is hollowed out along a first direction and will not be covered by the color layer located in the first direction. Moreover, the material of the above color layer is a ceramic material, the layer thickness of the above color layer is less than 0.1mm, and the color of some color layers is different from the color of other color layers.

Based on the above purpose and other purposes, the present invention provides another 3D printing structure, which has multiple color layers made by 3D printing, and these color layers include a first color layer group and a second color layer group. Among them, the first color layer group is composed of multiple first color layers, and the first color layer presents a first color. The second color layer group is composed of multiple second color layers and is arranged on one of the two surfaces of the first color layer group. The second color layer presents a second color, and the second color layer group has at least one patterned penetration area, and the penetration area is hollowed along a first direction. In addition, the first color is different from the second color, the material of the above color layer is a ceramic material, and the layer thickness of the above color layer is less than 0.1mm.

In the above 3D printing structure, the first color is black and the second color is white.

Based on the above and other purposes, the present invention provides another 3D printing structure, which has a plurality of color layers made by 3D printing, and these color layers include a first color layer group and a second color layer group, and the second color layer group is arranged on one of the two surfaces of the first color layer group. The first color layer group is formed by stacking a plurality of first color layers, and these first color layers have a first color system, and at least part of the first color layers have different brightness. Moreover, the first color layer group has at least one patterned first penetration area, and the first penetration area penetrates at least part of the first color layer. The second color layer group is formed by stacking a plurality of second color layers, which have a second color system, at least part of the second color layers have different brightness, and the second color layer group has at least one patterned second penetration area, which penetrates at least part of the second color layer. The first color system and the second color system are different from each other, the material of the color layer is a ceramic material, and the thickness of the color layer is less than 0.1mm. Moreover, along a first direction, the first penetration area and the second penetration area will not be blocked by other color layers in the first direction.

In the above-mentioned 3D printing structure, there are multiple first penetration areas and second penetration areas, and part of the second penetration areas are connected to the first penetration areas, and the second penetration areas are larger than the first penetration areas.

In the above-mentioned 3D printing structure, these color layers further include a third color layer group, which is formed by stacking multiple third color layers. These third color layers have a third color system, at least part of the third color layers have different brightness, and the third color layer group has at least one patterned third penetration area, which penetrates at least part of the third color layer. Among them, the first color system, the second color system, and the third color system are different from each other. Moreover, along the first direction, the third penetration area will not be blocked by the color layer in the first direction.

In the above 3D printing structure, there are multiple third penetration areas, some of which are connected to all the second penetration areas and all the first penetration areas, and the third penetration areas are larger than the second penetration areas and the first penetration areas.

In the above-mentioned 3D printing structure, in any color layer group (i.e., the first color layer group, the second color layer group, or the third color layer group), the brightness of the color layer increases along the first direction.

In the above-mentioned 3D printing structure, the area occupied by each color layer decreases along the first direction.

In the above 3D printing structure, the thickness of the color layer is 60μm.

In order to make the above features and advantages of the new model more obvious and easy to understand, the following is a detailed description of the preferred embodiment with the attached drawings.

3: Human face

Y: Direction

R, B, L: Area

10, 20, 30, 400, 401, 402, 403, 404, 405: 3D printed structures

40: Two-dimensional pattern

100, 300, 410, 420, 430: Color layer

110, 210, 310: first color layer group

112, 312: First color layer

314, 314a, 314b, 314c: first penetration zone

120, 220, 320: Second color layer group

122, 322: Second color layer

124: Penetration Zone

324, 324a, 324b, 324c: Second penetration zone

130, 230, 330: Third color layer group

132, 332: The third color layer

224: Second penetration zone

234, 334, 334a, 334b: The third penetration zone

240: Fourth color layer group

244: The fourth penetration zone

250: Fifth color layer group

254: Fifth penetration zone

260: Sixth color layer group

264: Sixth penetration zone

Figure 1 shows a human face image.

FIG2 shows a three-dimensional diagram of the 3D printing structure of the first embodiment of the present invention.

Figure 3 shows the structure of the color layer in the 3D printing structure.

FIG4 shows a top view of the 3D printing structure of the second embodiment of the present invention.

FIG5 shows a front view of the 3D printing structure of the second embodiment.

Figure 6 shows a part of the painting “Zhigongtu” by the Qing Dynasty painter Xie Sui.

FIG7 shows the three-dimensional 3D printed structure corresponding to FIG6.

Figures 8A to 8C are more detailed structural schematic diagrams of the first color layer group, the second color layer group, and the third color layer group, respectively.

FIG9A shows a two-dimensional pattern.

Figures 9B-9G show various 3D printed structures corresponding to the two-dimensional pattern of Figure 9A.

The best way to understand the present invention is to refer to the detailed content and accompanying drawings set forth herein. Various embodiments will be discussed below with reference to the accompanying drawings. However, those skilled in the art will appreciate that the detailed descriptions given herein with respect to the accompanying drawings are for illustrative purposes only and do not represent the true proportions of the components. In addition, the objects and/or methods to be protected by the present invention may extend beyond the scope of the described embodiments. For example, the teachings given and the requirements of a particular application may produce a variety of optional and suitable methods to implement the functions of any detail described herein. Therefore, the objects and/or methods to be protected by the present invention may extend beyond the implementation exceptions of the specific implementation selection range described below.

The following embodiments involve some technical terms related to color science, which are briefly introduced here. According to color science, the three elements of color are hue, brightness, and saturation. Among them, hue refers to the name of the color, which is used to distinguish the difference between colors. Brightness refers to the brightness of the color. The higher the brightness, the brighter the color, and the lower the brightness, the darker the color. The color with the highest brightness is white, and the color with the lowest brightness is black. Saturation refers to the degree of color vividness. Any pure color added to other colors will reduce its saturation. For more detailed information, you can refer to the following website: https://jibaoviewer.com/project/582957e9f7b1203f59a4f61a

In addition, the present invention also uses another term related to color: color system. The color system of the present invention refers to a combination of colors with similar hues. For example, the yellow color system may include similar hues such as dark yellow, white yellow, and light yellow. In addition, the manufacturing method and required materials of the 3D printing structure of all the following embodiments can be implemented with reference to patents US6596224B1 or US9757801B2.

Please refer to FIG. 2 and FIG. 3. FIG. 2 is a three-dimensional diagram of the 3D printing structure of the first embodiment of the present invention, and FIG. 3 is a diagram of the structure of the color layer in the 3D printing structure. In this embodiment, the 3D printing structure 10 is formed by stacking a plurality of color layers 100. These color layers 100 are made by 3D printing, and the thickness of each color layer 100 is less than 0.1 mm. These color layers 100 include a first color layer group 110 and a second color layer group 120. The first color layer group 110 is composed of a plurality of first color layers 112, and the second color layer group 120 is composed of a plurality of second color layers 122, wherein the second color layer group 120 is disposed on one of the two surfaces of the first color layer group 110. In this embodiment, the first color layer 112 is black, and the second color layer 122 is white. In addition, the second color layer set 120 also has a patterned penetration area 124. The penetration area 124 can be regarded as a hollow part of the second color layer set 120, and the consumer can see the color of the first color layer set 110 through the penetration area 124. In addition, in this embodiment, the 3D printing structure 10 also includes a third color layer set 130. The third color layer set 130 has the same structure as the second color layer set 120, and is also composed of a plurality of third color layers 132, and is disposed on another surface of the first color layer set 110. Therefore, whether the consumer is viewing from the top or bottom of the 3D printing structure 10, he can observe the same pattern. Of course, those with ordinary knowledge in the art may choose not to set the third color layer group 130. It should be noted that the above FIG. 3 is only for illustration and is not drawn according to the scale of the actual object; for example, the number of layers of the color layers in FIG. 3 does not represent the number of layers of the actual color layers. In this embodiment, the thickness of each color layer 100 is 60 μm, the number of layers of the first color layer group 110 is 6 layers, and the number of layers of the second color layer group 120 and the third color layer group 130 are 12 layers each, so the 3D printing structure 10 is 1.8 mm high. In this embodiment, the material of the color layer 100 is a ceramic material. In this embodiment, the colors of the second color layer 122 and the third color layer 132 are the white color of the ceramic material itself, and the color of the first color layer 112 is the black colorant added to the ceramic slurry. There is no need to glaze the 3D printed structure 10 after sintering, so the fine texture structure on the 3D printed structure 10 is also clearly visible.

In the above-mentioned embodiment, all the color layers 100 are divided into three color layer groups, but those with ordinary knowledge in the art should understand that the number of color layer groups can be greater. Please refer to Figures 4 and 5. Figure 4 shows a top view of the 3D printing structure of the second embodiment of the present invention, and Figure 5 shows a front view of the 3D printing structure of the second embodiment. In the second embodiment, the feature of the 3D printing structure 20 is that when the user looks from top to bottom, the brightness of the color increases from right to left in 6 stages. In this 3D printing structure 20, the color layer is divided into 6 color layer groups, namely the first color layer group 210, the second color layer group 220, the third color layer group 230, the fourth color layer group 240, the fifth color layer group 250, and the sixth color layer group 260. Each color layer group is composed of a color layer 100 similar to that shown in FIG. 3. In this embodiment, the first color layer group 210 is black, the sixth color layer group 260 is white, and the other color layer groups are grays of different brightness.

Please continue to refer to Figure 5. In the 3D printing structure 20, except for the first color layer group 210, other color layer groups are provided with a penetration area (the range is indicated by a dotted line in Figure 5), which are the second penetration area 224, the third penetration area 234, the fourth penetration area 244, the fifth penetration area 254, and the sixth penetration area 264. Here, each penetration area is hollowed out along the first direction (the Y direction in this embodiment) and will not be blocked by other color layers in the first direction. For example, the third penetration area 234 will not be blocked by the fourth color layer group 240, the fifth color layer group 250, and the sixth color layer group 260 along the Y direction; in this way, when the viewer observes in the reverse direction of the Y direction, the first color layer group 210 and the second color layer group 220 can be seen.

In the second embodiment described above, only 6 levels of grayscale are presented, but those with ordinary knowledge in the field should understand that similar concepts can enable the 3D printing structure to present more levels of grayscale. For example, if there are 256 layers of color in the 3D printing structure, 265 levels of grayscale can be presented. In this way, the 3D printing structure can be used to present more detailed black and white patterns. In addition, the new 3D printing structure can also be used to present color patterns. Please refer to the following embodiments for details.

Please refer to Figure 6, which shows a part of the "Zhigongtu" painted by the Qing Dynasty painter Xie Sui. In Figure 6, the entire picture can actually be divided into three color systems: yellow, blue, and red. Among them, the color system of area R is red, the color system of area B is blue, and the remaining area L is yellow. In each area, although they belong to the same color system, the hue, brightness, and saturation are slightly different. For example, in area L, the farmer's hat is dark yellow, the farmer's top is white and yellow, and the background of the entire picture is light yellow. If the two-dimensional figure shown in Figure 6 is to be made into a three-dimensional 3D printing structure, it can be designed as a 3D printing structure as shown in Figure 7. Please refer to FIG. 7 , which shows a 3D printing structure corresponding to FIG. 6 . The 3D printing structure 30 has a plurality of color layers 300 made by 3D printing, and the thickness of the color layer 300 is less than 0.1 mm. In this embodiment, the thickness of the color layer 300 is 60 μm. The color layers 300 include a first color layer group 310, a second color layer group 320, and a third color layer group 330. The first color layer group 310 is formed by stacking a plurality of first color layers 312, the second color layer group 320 is formed by stacking a plurality of second color layers 322, and the third color layer group 330 is formed by stacking a plurality of third color layers 332. In this embodiment, the first color layer group 310 corresponds to the area L in FIG. 6, so the first color layer 312 belongs to the yellow color system, including: dark yellow, white yellow, and light yellow. The second color layer group 320 corresponds to the area B in FIG. 6, so the second color layer 322 belongs to the blue color system, including blue, etc. The third color layer group 330 corresponds to the area R in FIG. 6, so the third color layer 332 belongs to the yellow-red color system, including red, etc.

Next, please refer to FIG. 8A to FIG. 8C , which are respectively schematic diagrams showing the detailed structures of the first color layer group, the second color layer group, and the third color layer group. First, please refer to FIG. 8A , the first color layer group 310 has a plurality of patterned first penetration areas 314, and these first penetration areas 314 penetrate at least a portion of the first color layer 312 to expose a first color layer 312. For example, the first penetration area 314a corresponds to the farmer's hat in FIG. 6 , that is, the first penetration area 314a exposes the first color layer 312 in dark yellow. In one embodiment, the brightness of each first color layer 312 increases along the first direction (the Y direction in this embodiment); that is, the first color layer 312 with lower brightness (i.e., darker color) is located at the bottom, and the first color layer 312 with higher brightness (i.e., lighter color) is located at the top. The reason for this design is that when the object is thinner, more light will penetrate rather than be reflected; since the first color layer 312 located at the bottom may be partially located at the thinnest part of the entire 3D printing structure 30, if the first color layer 312 with higher brightness (i.e., lighter color) is set at the bottom, it may cause more light to penetrate the first color layer 312, resulting in a less obvious color presentation. Therefore, in the first color layer group 310 of the present embodiment, the dark yellow first color layer 312 corresponding to the farmer's hat is located at the lower part, the white and yellow first color layer 312 corresponding to the farmer's coat is located at the upper part, and the light yellow first color layer 312 corresponding to the background is located between the above two.

Next, please refer to FIG. 8B , the second color layer set 320 has a plurality of patterned second penetration areas 324, some of which penetrate at least a portion of the second color layer 322 to expose one of the second color layers 322. For example, the second penetration area 324a corresponds to the straps on the front of the farmer's pants in FIG. 6 , so the second penetration area 324a reveals the second color layer 322 in dark blue. In addition, some of the second penetration areas 324 penetrate all of the second color layer 322 to expose a first color layer 312. In other words, some of the second penetration areas 324 are connected to the first penetration areas 314. For example, the second penetration area 324c is connected to the first penetration area 314a (as shown in FIG. 8A ) of the first color layer set 310 to expose the first color layer 312. In addition, as can be seen from FIG. 6 , region B only occupies a small part of the entire figure, so it can be seen that the area of the entity of the second color layer group 320 is much smaller than the area of the entity of the first color layer group 310, and the area of the second transmission area 324 is larger than the area of the entity of the second color layer group 320. In one embodiment, the brightness of each second color layer 322 increases along the first direction (the Y direction in this embodiment); that is, the second color layer 322 with lower brightness (i.e., darker color) is located at the bottom, and the second color layer 322 with higher brightness (i.e., lighter color) is located at the top. The reason for this design is that the second color layer group 320 is adjacent to the first color layer group 310. If the color of the second color layer 322 located below is too light, it may be interfered by the first color layer group 310, resulting in a situation where part of the second color layer 322 is less obvious in color presentation.

Next, please refer to FIG. 8C , this color layer group represents the red color part in the two-dimensional image. The third color layer 332 at the top of this color layer group 330 is the upper surface of this three-dimensional 3D printing structure, showing light red and dark red in the red color system; and the third color layer group 330 has a plurality of patterned third penetration areas 334, some third penetration areas 334a penetrate at least part of the third color layer 332 to expose a third color layer 332, which is dark red in this embodiment, and some third penetration areas 334b penetrate all of the third color layer 332 to expose a second color layer 322 or a first color layer 312. In other words, some third penetration areas 334 are connected to the second penetration area 324, and some third penetration areas 334 are simultaneously connected to the second penetration area 324 and the first penetration area 314. In short, no matter the first transmission area 314, the second transmission area 324, or the third transmission area 334, they will not be blocked by other color layers 300 along the first direction (the Y direction in this embodiment), so that the viewer can see the revealed color layers 300. In one embodiment, the brightness of each third color layer 332 increases along the first direction (the Y direction in this embodiment); that is, the third color layer 332 with lower brightness (that is, darker color) is located at the bottom, and the third color layer 332 with higher brightness (that is, lighter color) is located at the top. The reason for this design is that the third color layer group 330 is close to the second color layer group 320. If the color of the third color layer 332 located below is too light, it may be interfered by the second color layer group 320, resulting in a less obvious color presentation of part of the third color layer 332. It should be noted that the above figures are only for illustration and are not drawn according to the scale of the actual object; for example, the number of color layers in Figures 7, 8A-8C does not represent the number of real color layers. In this embodiment, the height of the first color layer group 310 is about 1.98mm, the height of the second color layer group 320 is about 0.24mm, and the height of the third color layer group 330 is about 0.24mm.

In all the above embodiments, the color of each color layer 100 is uniform. For example, if a color layer 100 is black, it will only display black and will not display other colors. Therefore, if a pattern has n colors, when converting this pattern into the new 3D printing structure, the 3D printing structure must have at least n color layers to present this pattern, and these color layers can be stacked in n! ways, n! =n*(n-1)*(n-2)*....*3*2*1. The following will give an example for explanation.

Please refer to FIG. 9A , which shows a two-dimensional pattern 40, which is composed of three sub-patterns, from the outside to the inside, they are sub-pattern 41 (area of 16 units), sub-pattern 42 (area of 8 units), and sub-pattern 43 (area of 1 unit), and each pattern has a different color. In this embodiment, sub-pattern 41 is red, sub-pattern 42 is yellow, and sub-pattern 43 is blue. Please refer to FIG. 9B , which shows a 3D printing structure 400 corresponding to the two-dimensional pattern 40. This 3D printing structure 400 requires at least three color layers, from bottom to top, 410, 420, and 430, to present this two-dimensional pattern 40. In this embodiment, color layer 410, color layer 420, and color layer 430 correspond to sub-pattern 41, sub-pattern 42, and sub-pattern 43, respectively.

In fact, the color layer stacking method shown in FIG. 9B is only one of the methods, and there are other methods to present the two-dimensional pattern 40. According to the formula of full permutation combination, these color layers can be stacked in 6 ways (3!=3*2*1), which are shown in FIG. 9B-9G respectively.

In Figures 9B-9G, the numbers in the brackets on the right side of each color layer in the 3D printing structure 401~405 are the volume of each color layer entity and its calculation method (volume is on the left side of the brackets, and calculation method is on the right side of the brackets). It should be noted that since the thickness of each color layer is the same, it is only necessary to calculate the area of the top surface of each color layer entity to find the volume of each color layer entity.

In FIG. 9B of the present embodiment, the volume of the solid body of the color layer 430 is set to 1 unit, and the thickness of each color layer is the same, then the volume of the color layer 410 is 25 units, the volume of the color layer 420 is 9 units, and the volume of the 3D printing structure 400 of FIG. 9B is 35 units. The total volume of the three color layers (i.e., color layer 410, color layer 420, and color layer 430) of the 3D printing structure 401 in FIG. 9C is 43 units, the total volume of the three color layers of the 3D printing structure 402 in FIG. 9D is 42 units, the total volume of the three color layers of the 3D printing structure 403 in FIG. 9E is 57 units, the total volume of the three color layers of the 3D printing structure 404 in FIG. 9F is 58 units, and the total volume of the three color layers of the 3D printing structure 405 in FIG. 9G is 65 units.

Comparing the total volume of the six stacking methods shown in Figures 9B-9G, it can be seen that the 3D printing structure 400 of Figure 9B occupies the smallest volume in space, that is, the 3D printing structure 400 of Figure 9B requires the least material. The calculation of the area of the upper surface of each color layer in the six stacking methods shown in Figures 9B-9G can be summarized into the following general calculation formula: The area of the upper surface of each color layer = the total top view area - the sum of the areas of each color layer below the color layer in the top view direction

In Figures 9B-9G, the numbers in the brackets on the right side of each color layer are the volume of each color layer and its calculation method (the volume is on the left side of the brackets, and the calculation method is on the right side of the brackets). It should be noted that since the thickness of each color layer is the same, it is only necessary to calculate the area of the top surface of each color layer to find the volume of each color layer.

Here, the top-view direction is the opposite direction of the first direction mentioned above. Therefore, if the color layer corresponding to the sub-pattern with the largest area presented in the top-view direction is placed at the bottom, and the color layers are stacked from bottom to top in the order of the area presented by the sub-pattern in the top-view direction from large to small, the color layer with the smallest area presented in the top-view direction is placed at the top. If the thickness of each color layer is the same, the volume of the 3D structure made by this stacking method is the smallest. Therefore, in order to save materials and space, choosing the 3D printing structure 400 of Figure 9B would be the best choice. On the other hand, if the pattern is viewed from above, the top color layer is closest to the eyes. If the sub-pattern with the smallest area is placed at the top, it is closest to the eyes and is easier to see.

In summary, this new 3D printing structure can present two-dimensional patterns in a three-dimensional way. In addition to giving viewers a different visual experience, its manufacturing method will not encounter the following problems like the conventional ceramic painting: fine texture structures are not easy to color, and surface tension causes blurred boundaries.

This new model shows its characteristics that are completely different from the known technology in terms of purpose, means and effect, which is a major breakthrough. However, it should be noted that the above-mentioned embodiments are only illustrative of the principle and effect of this new model, and are not used to limit the scope of this new model. Anyone familiar with this technology can modify and change the embodiments without violating the technical principle and spirit of this new model. The scope of protection of the rights of this new model should be as described in the scope of the patent application described below.

10: 3D printed structure

110: First color layer group

120: Second color layer group

124: Penetration Zone

130: Third color layer group

Claims (9)

A 3D printing structure is made by 3D printing. The 3D printing structure has multiple color layers, wherein the color layers include: a first color layer group, composed of multiple first color layers, the first color layers present a first color; and a second color layer group, composed of multiple second color layers, arranged on one of the two surfaces of the first color layer group, the second color layer presents a second color, and the second color layer group has at least one patterned penetration area, the penetration area is hollowed out along a first direction and will not be covered by the color layers located in the first direction; wherein the first color is different from the second color, and the material of the above color layers is a ceramic material. A 3D printing structure is made by 3D printing. The 3D printing structure has a plurality of color layers, wherein the color layers include: a first color layer group, which is formed by stacking a plurality of first color layers, wherein the first color layers have a first color system, wherein at least a portion of the first color layers have different brightnesses, and the first color layer group has at least one patterned first penetration area, wherein the first penetration area penetrates at least a portion of the first color layer; and a second color layer group, which is formed by stacking a plurality of second color layers, and is disposed on the first color layer group. On one of the two surfaces, the second color layers have a second color system, at least part of the second color layers have different brightness, and the second color layer group has at least one patterned second penetration area, the second penetration area penetrates at least part of the second color layer; wherein the first color system and the second color system are different from each other, and the material of the color layer is a ceramic material; wherein along a first direction, the first penetration area and the second penetration area both penetrate the color layers disposed thereon without being blocked by these color layers. A 3D printing structure as described in claim 2, wherein in the first color layer group, the brightness of each first color layer increases along the first direction. A 3D printing structure as described in claim 2, wherein in the second color layer group, the brightness of each second color layer increases along the first direction. The 3D printing structure as described in claim 2, wherein the color layers further include: a third color layer group, which is formed by stacking a plurality of third color layers, wherein the third color layers have a third color system, at least part of the third color layers have different brightness, and the third color layer group has at least one patterned third penetration area, wherein the third penetration area penetrates at least part of the third color layer; wherein the first color system, the second color system, and the third color system are different from each other; wherein the third penetration area is hollowed out along the first direction and will not be obscured by the color layers located in the first direction. A 3D printing structure as described in claim 5, wherein in the third color layer group, the brightness of each third color layer increases along the first direction. A 3D printing structure as described in any one of claim items 1 to 6, wherein the color of each color layer is different from the color of other color layers. A 3D printing structure as described in any one of claims 1 to 6, wherein the area occupied by each color layer decreases along the first direction. A 3D printing structure as described in any one of claim items 1 to 6, wherein the thickness of the color layer is less than 0.1 mm.