Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4836828.

I don't own a disk sander and the hand sanding for details take to much time. So I created this crappy mini disk sander for details on wood, plastic and even metal.

you'll need some assembling with some short screws to thigh the pieces together.

The motor I use is 25mm wide (almost an inch) and the switch is the small typical square one. After that, you can use a random USB cable, connect the black and red cables and you are done!