Longitudinal fidget ring

Have fun with this longitudinal fidget ring! It spins only a few times until it stops. Then you need to spin it in the opposite direction.I uploaded many sizes (inner diameter in mm from 12.3mm for kids to 24mm for big fingers, please use the conversion table below in case you are used to your local ring sizes and use the closest value in millimeter). The STL filenames have the inner diameter in mm in the filename. In case you need even more different sizes, please install OpenSCAD on your own c