I had bought a small motor with wheel and mount some time ago, and now I needed more of the motors for another project, but I did not need the wheel. It turned out to be rather difficult to find the mount (actually I did not find it without also having to buy a wheel), so I printed one instead.

The motors are like this: http://www.ebay.com/itm/321773207015 Or this: http://www.ebay.com/itm/311331749282 And you can get them with many different gear ratios and for different voltages.

The mount that I had from the other motor was for a M2 (maybe M2.5... not sure) nut, but I wanted to use it with M3, so modified it slightly. This thing includes my copy of the original mount and my moded M3 version.

I'm not sure this video will show a lot of this design, except from the fact that the motor mount is a very central part of the video, and now that I have made the video, it has to be used for something ;) https://www.youtube.com/watch?v=5xYdjzNxEss