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.