This is a 3d printer mechanical designed and it's cartesian based 3dprinter which move in x and y axis by ballscrew for minimize the back lash and use 4 z-axis motors with lead screw because z doesn't have very much movement and back lash because the weight is reduse backlash and always have 1 direction pressure. Why i used 4 motor for z-axis because of aute real bed leveling. The link for buying parts from Iran: https://docs.google.com/spreadsheets/d/1tne9DM27_kF6g1XIp56oD7t-js4sJgCW2fkVTmby7ow/edit?usp=sharing