This is my print in place fidget ring design. The concave inner ring keeps the convex outer ring in alignment and allows it to spin freely without any assembly need. I have included a section view of this geometry below. If you enjoy the design a like or make would be appreciated. Check out my new Banana Switchblade design here You can obtain a commercial license to sell prints of this here. (https://www.printables.com/@OwenTF_1791221#join:894)