Summary These fun rings print in 2 pieces. You twist them together! Combine colors. With a little sanding after printing they feel more comfortable to wear. The stl I have provided prints at about 23mm outside dia. Or 21mm inside dia. That is around a size 11 I believe. I scaled it down to fit on my girls. I made and printed these last year, so if you print one, please tell me the dimensions and I'll update this description. This was inspired by a Paul van Doorenmalen design. Check out his stuff! ID: Defauld Also thanks to David Carter, Vinchlet, for test printing and feedback! Check his stuff out too! Thanks for looking.