Abstract: Provided are a three-dimensional (3D) printing material, and a printing method, preparation method, and printing filament thereof, which relate to the technical field of 3D printing. The 3D printing material provided in the present disclosure is produced by introducing a crystalline polymer with a high melting point based on a material including only a single crystalline polymer. The 3D printing material exhibits both excellent printing warpage resistance and superior heat resistance.

Abstract: Provided are a composite material for three-dimensional (3D) printing, a 3D printing method, and a 3D printed part. The composite material includes a continuous matrix phase and a fibrous dispersed phase distributed in the continuous matrix phase. The continuous matrix phase is made of a first crystalline polymer and the fibrous dispersed phase is made of a second crystalline polymer. A melting point of the second crystalline polymer is higher than a melting point of the first crystalline polymer. The composite material for 3D printing is further subjected to single-screw extrusion to produce the 3D printing filament. The 3D printing filament is then subjected to 3D printing. Both an extrusion temperature and a printing temperature are higher than the melting point of the first crystalline polymer and lower than the melting point of the second crystalline polymer.

Abstract: A printing method of a 3D printer is provided. The method includes: sequentially conveying a printing material into a preheating section, a first heat resistance section, and a melting section of a printing nozzle of the 3D printer along a target direction, and extruding the printing material from an outlet of the printing nozzle; setting a heating temperature of the preheating section to a temperature T1, so that the printing material remains in a solid state when passing through the preheating section; and setting a heating temperature of the melting section to a temperature T2, so that the printing material is transformed into a fluid state at the temperature T2. The first heat resistance section restricts heat conduction between the preheating section and the melting section, so that the printing material in the preheating section remains in the solid state.

Abstract: A 3D printing nozzle, a 3D printer and a printing method are provided. The 3D printing nozzle includes a nozzle body to convey and extrude a printing material along a target direction, and sequentially includes at least a preheating section, a first heat resistance section, and a melting section along the target direction; and a heating device connected to the nozzle body. During operation, the heating device heats the preheating section to a temperature T1, and the melting section to a temperature T2. The printing material remains solid when passing through the preheating section at the temperature of T1; the printing material turns into a fluid state when passing through the melting section at the temperature T2, The first heat resistance section restricts the heat conduction between the preheating section and the melting section, so that the printing material in the preheating section remains in the solid state.

Abstract: A 3D printing wire, a method for preparing the 3D printing wire, a 3D printing method, and a 3D printing apparatus are provided. The method for preparing the 3D printing wire includes: co-extruding a first polymer matrix composite and a second polymer matrix composite to produce a 3D printing wire with a core-shell structure. In the 3D printing wire with the core-shell structure, a shell structure formed by the second polymer matrix composite is wrapped around a core structure formed by the first polymer matrix composite. A filler material volume fraction of the first polymer matrix composite is larger than a filler material volume fraction of the second polymer matrix composite. The material for the shell structure includes an unfilled polymer material with a composite filling content of zero.

Abstract: A 3D printing wire, a method for preparing the 3D printing wire, a 3D printing method, and a 3D printing apparatus are provided. The method for preparing the 3D printing wire includes: co-extruding a first polymer matrix composite and a second polymer matrix composite to produce a 3D printing wire with a core-shell structure. In the 3D printing wire with the core-shell structure, a shell structure formed by the second polymer matrix composite is wrapped around a core structure formed by the first polymer matrix composite. A filler material volume fraction of the first polymer matrix composite is larger than a filler material volume fraction of the second polymer matrix composite. The material for the shell structure includes an unfilled polymer material with a composite filling content of zero.

Abstract: A 3D printing nozzle, a 3D printer and a printing method are provided. The 3D printing nozzle includes a nozzle body to convey and extrude a printing material along a target direction, and sequentially includes at least a preheating section, a first heat resistance section, and a melting section along the target direction; and a heating device connected to the nozzle body. During operation, the heating device heats the preheating section to a temperature T1, and the melting section to a temperature T2. The printing material remains solid when passing through the preheating section at the temperature of T1; the printing material turns into a fluid state when passing through the melting section at the temperature T2, The first heat resistance section restricts the heat conduction between the preheating section and the melting section, so that the printing material in the preheating section remains in the solid state.