Zero setting method for 3D printer

The invention discloses a zero setting method for a 3D printer, and belongs to the technical field of 3D printers. In order to solve the problems that the control precision is lowered when the abrasion situation occurs in the adjusting process of a limiting rod, the zero setting scheme is complex, and the height of a printing platform cannot be adjusted, the zero setting method is technically characterized in that 1, the appropriate Z-axis coordinate maximum value Z is set in a control mainboard; 2, the Z-axis coordinate position of a printing platform in a current coordinate system is obtained; 3, Z-axis coordinate processing is conducted on print files when an upper computer control program transmits the print files to the printer; 4, the printer prints the received files, and the received files can be printed on the printing platform; and 5, whenever the printing platform is replaced, the corresponding height of the printing platform and subsequent operation need to be re-obtained, if the height of the pri