About this 3D model

http://bunkai.sakura.ne.jp/bunkai-wp/3d_printer/607/ NEMA17??????????????????? reprap??????????????????????????????????????????????????????????????????????????????????????? PRN3D????????????????????????? It is a dust proof cover parts of NEMA17 motors. It is the motor of the size that is used as a standard on reprap, but the motor that is not sealed to the bearing portion of the shaft back there. To protect such a motor, was produced a dust prevention cover. You have created the PRN3D for, but it is the part that can be used for general purposes.