Curvy Fidget Spinner

This is a spinner design I created while learning to model with Fusion 360. Uses four 608 bearings which friction-fit into place (use a mallet to seat them) and the caps have features to friction-fit as well. No glue required. I've printed this design in PLA, ABS, and nylon with excellent results.

Note that the design has some bridge areas, but can generally print without supports. Some slicers do better than others with the bridges--Simplify3D and Slic3r cross the bridge using short moves and don't need support, but with Cura you may want to add support.