Mechanum wheel, 0.2" flat-shaft.

I made some changes to Joakim's original parts, giving the wheels a hub and set-screw, as well as implementing small pressure pads to hold the roller shafts in place, instead of requiring glue. This allows the rollers to be changed in the event that one breaks.

My set is printing at the moment, I'll get some finished product pictures when they finish!

EDIT: For the first few people who downloaded this, I got the cores mixed up, but I fixed it now, so you should re-download.