Method and system for fabricating colored 3D object

1. A method for fabricating a colored 3D object by layer-by-layer printing, comprising:

layering a target object;

obtaining molding data corresponding to each layer of the target object according to structural information and color information of each layer of the target object, the molding data including layer-structure data and layer-color data

forming, based on the layer-structure data of the target object, a layer-structure product by printing of a molding material, wherein the molding material is ejected with an ejection and the layer-structure product has a structure including a grid structure with openings;

forming a layer-print product by printing color inks on the layer-structure product based on the layer-color data of the target object, wherein the color inks are printed synchronously or following the formation of the layer-structure product; and

repeatedly forming the layer-print product to provide a plurality of the layer-print products, and fabricating the colored 3D object from the plurality of the layer-print products, stacked one on another, wherein

the molding material is ejected by a print head with a plurality of ejection orifices, the plurality of ejection orifices including first orifices and second orifices,

the molding material is only ejected through the first orifices, and

the printing color inks is ejected through the second orifices to the openings of the grid structure.

2. The method according to claim 1 , wherein at least a part of the color inks infiltrates into the layer-structure product to form the layer-print product.

3. The method according to claim 2 , wherein:

the molding material includes a photosensitive resin material, and

the color inks include solvent inks.

4. The method according to claim 3 , wherein:

the photosensitive resin material has a viscosity of 14 cps to 180 cps at 25° C. and a viscosity of 5 cps to 15 cps at 25° C. to 80° C.; and

the solvent inks have a viscosity of 4 cps to 14 cps, and a surface tension of 22 mN/m to 35 mN/m.

5. The method according to claim 1 , wherein:

the ejection is performed by an interval ejection or by alternating a full ejection with the interval ejection; and

when forming the layer-print product, printing of the color ink is performed at locations where the molding material is non-ejected.

6. The method according to claim 5 , wherein in the ejection, when the full ejection is performed, a quantity of ejection holes is an even number.

7. The method according to claim 1 , wherein:

when the layer-print product is formed following the formation of the layer-structure product, two adjacent layer-structure products are formed in a same printing direction; and

when the layer-print product and the layer-structure product are synchronously formed, the two adjacent layer-structure products are formed in opposite printing directions.

8. The method according to claim 1 , wherein repeatedly forming the layer-print product further includes:

forming, according to the layer-structure data, a layer-support product by printing on a supporting material, wherein the layer-support product is configured to provide a support for two adjacent layer-print products.

9. The method according to claim 1 , wherein forming the layer-structure product includes:

using one molding material for printing; or

using different molding materials for printing, wherein the different molding materials have a same shrinkage ratio.

10. The method according to claim 1 , wherein the molding material includes one of a white material and a transparent material.

11. The method according to claim 1 , wherein

locations of the openings of the grid structure correspond to moving trajectories of the second orifices.