Thumb Crank for NEMA17 Motor Shaft

Ever wanted to manually move your reprap Z-axis easily without turning the whole thing over? Well have I got the product for you!

This handy little thing slips over the back end of a NEMA17 motor shaft and clamps on tight by means of an M3 bolt and captive nut.

Edit:
Now includes an IGS file, for extra compatibility. I encourage everyone to use transferrable formats like IGES and STEP.