In order to develop the process of metal/polymer 3D printing

a coaxial 3D printing device for molding low melting-point alloys and polymer composites was designed. Driven by a piston extruder and heated with heating systems

alloys and polymer composites are extruded through the nested coaxial nozzle

thus continuously integrated and molded into 3D printed composite components with better mechanical properties. In addition

the process parameters such as extrusion pressure

temperature and speed are simulated by fifinite element method and the inflfluence of printing speed

temperature

viscosity and other parameters is explored under experiments to optimize the printing process. Finally

the feasibility of such device and process is verifified in practice

which exhibits a possible method for the 3D printing of low melting-point alloy and polymer composites.