Shopsmith Power Coupler
thingiverse
USE AT YOUR OWN RISK!!! I bought a Shopsmith that was missing a number of parts, one of which was the power coupler that drives the belt sander. I measured the keyed collars (which fortunately DID come with the machine), spent about 1/2 hour in Sketchup to produce the attached STL. The fit is snug, but almost spot-on. My print head was a bit too close to the bed, so the 4 groove side was a bit squished, but a few taps with a mallet got it on. Video of it in action is here: http://youtu.be/h-FRnJkr3hk This probably won't break away as the OEM part will, so I repeat, USE AT YOUR OWN RISK! I printed mine in ABS, but PLA should work too.
With this file you will be able to print Shopsmith Power Coupler with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Shopsmith Power Coupler.