If the screw speed of the extruder is too fast, the ceramic paste at the forming platform will be in a state of oversupply, and the extruded ceramic paste can not be distributed immediately. The ceramic wire under the printing nozzle will accumulate and extrude, and expand due to the surface tension, thus affecting the extrusion molding. Printing speed and screw speed of extruder can not be determined separately, they affect extrusion quality together. Firstly, the printing speed is determined. When the printing speed is too low, the printing time will be too long and the molding efficiency will be reduced