Abstract:At present, desktop three dimensional(3D)printer has gotten lots of attention in many fields. Compared with traditional cutting machining, 3D desktop printer makes the parts through the principle of layered manufacturing in fused deposit to entity, which has lower production efficiency. In order to improve the productivity of a desktop 3D printer, a way to optimize part build time was provided. That is, the surface layer, the bottom and top outline were printed by nozzle of 0.4 mm in diameter, while the internal filling was performed by the nozzle of 1.2 mm in diameter. Last, through contrast experiment to the existing single nozzle process, the new process method has shortened the parts’ build time substantially, meanwhile ensured the surface roughness under the same premise. It provides a new idea for improving the desktop 3D printing efficiency.