Modeled from a sample of the Pololu 37D mm metal DC gearmotor (70:1 version). Maybe not useful to print; this is intended for size comparison in the CAD program with brackets or other hardware. I did not include the two power terminals on the back of the motor. A sample print measured within 0.1mm of the real thing everywhere I checked, but please confirm dimensions yourself if you are using it for anything important. Here is a mounting bracket for this motor: http://www.thingiverse.com/thing:386102