Improved Fidget Spinner Caps

Here is a slight improvement over some of the caps I've seen available. I added a small ridge where the bearing hub hits preventing the caps from rubbing on the bearing seals or outer ring. There are two types, one with a concave center and one that is flat. The concave cap didn't print well with PETG because I could not get the supports out. Other material will be better in that regard. I also include 3 plugs for outer bearings that you may used in the spinner. They also work great as coo