The present disclosure provides a method for fabricating a mixed-material 3D object, including forming, based on layer-print data of a target object, a layer-print product by one-by-one printing a plurality of pixels, using N.sub.0 types of main materials for the target object; forming a plurality of the layer-print products by repeatedly forming the layer-print product; and forming a mixed-material 3D object by stacking one of the layer-print products on another. Each of the plurality of pixels is printed by N.sub.1 types of the main materials and N.sub.2 types of auxiliary materials, N.sub.1N.sub.0, and when N.sub.1<N.sub.0, N.sub.21, and each of the plurality of pixels is formed by ejecting a plurality of ink droplets.

It discloses a high-speed reciprocating color 3D printer; said printer includes a nozzle assembly that is horizontally movable in one direction, preferably an X-axis direction, and a workbench that is vertically movable in the Z-axis direction. A plurality of spray pipes are mounted on the nozzle assembly, wherein, the spray pipes contains a variety of liquid printing materials, including white matrix material and a variety of color materials. In a movement process, each spray pipe works separately. The white matrix material is used to print out the image firstly, especially the darker area of the image, and then the color of the image is printed through the color material, and the resulting image partially protrudes outward.

A three-dimensional printing method for a three-dimensional printer is provided. The three-dimensional printer includes a model printing head and a color printing head arranged along an X-axis and co-constructed, wherein the model printing head prints a forming layer on an X-Y plane of a platform of the three-dimensional printer, and the color printing head colors a coloring zone of the forming layer along a Y-axis. The three-dimensional printing method includes: providing information of the coloring zone of the foaming layer; determining the number of colorings of the color printing head according to the information of the coloring zone by a processor; and driving the model printing head by the processor to print the forming material outside a region of the forming layer.

In an example of a three-dimensional printing method, a polymeric build material is applied. A fusing agent is selectively applied on at least a portion of the polymeric build material. The fusing agent includes cesium tungsten oxide nanoparticles, a zwitterionic stabilizer, and an aqueous vehicle. The polymeric build material is exposed to electromagnetic radiation to fuse the portion of the polymeric build material in contact with the fusing agent to form a layer.

A color three-dimensional printing method and three-dimensional printing equipment are provided, which are adapted to present a color pattern on a three-dimensional object. The method includes following steps. A color image including the color pattern is obtained, and the color image includes a plurality of pixels. An inkjet depth of each of the pixels is determined based on a color feature of each of the pixels. A three-dimensional model of the three-dimensional object is sliced to generate layer information of a plurality of layer objects. A plurality of inkjet pictures corresponding to the layer objects are obtained based on the inkjet depths of the respective pixels.

A method of molding a three-dimensional object, the method including: generating modeling data for the three-dimensional object; determining a region to be modeled by layering the dot using the modeling ink based on the modeling data; determines a color region to be colored by discharge of the coloring ink on a surface of a set of the layered dot with the modeling ink, based on the modeling data to reduce a difference in depth in a normal direction of a surface of the three-dimensional object; generating modeling ink discharge data for discharging the modeling ink, and coloring ink discharge data for discharging the coloring ink; and causing the modeling ink and the coloring ink to be discharged in accordance the discharge data of the modeling ink and the coloring ink, and performing modeling and coloring of the three-dimensional object.

A method of slicing and printing colour 3D model is disclosed. The method includes following steps: loading a model data corresponding to a colour 3D model; adding a pollution-blocking structure next to the colour 3D model; executing a slicing process to the pollution-blocking structure and the colour 3D model for generating a plurality of pollution-blocking slices and a plurality of model slices and configuring colour each of the model slices; and, controlling a modeling nozzle (100) of a multi-colour 3D printer (1) to print the pollution-blocking slices and the model slices layer by layer and controlling a coloring nozzle (102) of the multi-colour 3D printer (1) to color each of the model slices.

During formation of a three-dimensional object, a layer of ink is flattened in a more suitable manner. A forming apparatus 10 for forming a three-dimensional object by additive manufacturing includes an inkjet head, a platform 16, a main scanning driver 14, a sub-scanning driver 18, a deposition direction driver 20, and a flattening roller 302. The sub-scanning driver 18 causes the inkjet head to perform, in between main scanning operations, a sub-scanning operation in which the inkjet head relatively moves by a predetermined forwarding distance in a sub-scanning moving direction, which is a predetermined direction. During the sub-scanning operation, the flattening roller 302 moves in the sub-scanning moving direction together with the inkjet head. The flattening roller 302 is disposed in a tilted manner such that a first end is located on a forward end in the sub-scanning moving direction, a second end is located on a rearward end in the sub-scanning moving direction, and the height in the deposition direction of the second end on the rearward end is higher than the height in the deposition direction of the first end on the forward end.

A three-dimensional (3-D) printing apparatus and an inkjet coloring method thereof are provided. The 3-D printing apparatus includes a platform, a three-dimensional printing head, an inkjet head and the method includes following steps. A layer thickness of at least one layer object forming a 3-D object is obtained. An ink discharge volume of an ink layer is adjusted according to the layer thickness, wherein the ink discharge volume is in positive correlation with the layer thickness. A building material is melted and printed out on the platform according to the layer thickness by the three-dimensional printing head to form the at last one layer object. Ink is dispensed on the at last one layer object according to the adjusted ink discharge volume by the inkjet head to form the ink layer.

A printing method for color compensation adopted by a 3D printer (1) having a 3D nozzle (121) and a 2D nozzle (122) is disclosed. The printing method includes following steps of: controlling the 3D nozzle (121) to print a slicing object (2) of the 3D object upon a printing platform (11) according to a route file; controlling the 2D nozzle (122) to perform coloring on the printed slicing object (2) according to an image file; controlling the 2D nozzle (122) and the printing platform (1) to rotate relatively for creating an angular transposition between the 2D nozzle (122) and the printing platform (1) after the slicing object (2) is colored completely; and, controlling the 2D nozzle (122) to again perform coloring on the colored slicing object (2) after the 2D nozzle (2) and the printing platform (11) rotated relatively.