This is a prize which makes satisfying clicking sounds when spun. It uses a standard 608 skateboard bearing (22mm OD, 8mm ID, 7mm W) and 2 M3x10 flathead screws. Assembly is pretty straighforward. Press fit the bearing, snap on the wheel cover, press the clicker into the arrow cap, and screw the arrow cap into the frame.
Needs at least a 200x200mm bed to print.
The tolerances in this are generally about 100 microns, except for the bearing mount which is an exact fit. If you have trouble fitting the bearing, throw it in the freezer for a few hours to shrink it down.
There is also a STEP file if you want to play with the design. Enjoy!