Printing machine includes a guide; at least one printing station located along the guide; at least one supporting station for supporting a product to be printed by the printing station; at least a first and a second positioning units mounted along the guide, at least one of the positioning units being located at the printing station. The supporting station includes: a motor substantially integral with the supporting station for moving the supporting station along the guide; an acquisition device capable of acquiring an identification code from each of the positioning units when the supporting station is at each of the positioning units; a memory wherein reference codes corresponding to the identification codes and at least one reference distance corresponding to a distance between the first and second positioning units are stored; a processing unit configured to control the motor based on the acquired identification codes and on the reference codes and reference distance stored in the memory.