Stepping Motor Bearing Dust Proof Cover for NEMA17

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.