Fidget spinner that uses 608 bearing and 3 Australian fifty cent pieces.
Centre bearing caps are http://www.thingiverse.com/thing:1988435 by idnarbjm
Bearing is interference fit when printed at diameter 22.25mm and coins clip into place.
May need to scale up or down if you find your prints shrink from size or a spot of super glue on the bearing if it is too loose. It was perfect a fit on my printer.
Edit 12/2/17 Added 20 Cent Version using 6 Australian 20 Cent pieces.
Edit, 13/2/17 added a tighter tolerance file for the coins.
I used ABS to print would work with PLA as well.