Abstract: Effects of printing temperature and filling density on molded parts are studied by powder feed of poly(lactic acid) (PLA) in 3D printing process. For preparation of the 3D printing materials, PLA was mixed with different amounts of metal powders for the 3D printing molding process, and the mechanical performance of the molded specimens were measured. Experimental results indicated that increase of contents of the metal powder led to a decrease in tensile strength of the composite materials. In addition, thermal conductivity of the composite material was improved with an increase of the content of the metal powders, but the material expansion coefficient was reduced. This study provides a solution for the deformation problems of large parts in the 3D printing process.