FDM3D printers have been popular in various industries due to their cost advantages, but they also bring many problems due to their low printing accuracy. This paper designed a model for the Core XY structure for the desktop printing walking platform level FDM3D printer, the printer to print a higher space utilization, walking platform structure is more lightweight, minus the quality of the X axis stepper motor, thus greatly solve the printing process in the process of large inertia, in the face of small area print will be more careful, raise the precision of the printing.