Dummy NEMA 17 motor (shaft mount)

I decided to change my Prusa I3 clone to use only 1 Z-motor, driving the other leadscrew with a belt, so needed to remove the one motor. I designed this dummy motor to fit in its place.

It uses two 5 x 14 x 5 mm bearings and a 5mm shaft of about 100mm long for a dual shaft NEMA equivalent.

Also required are 4 x M3 nuts and longer M3 mounting screws.

I have supplied two top bearing retainers of different thicknesses. These change the overall length of the 'motor', which has a nominal len