This is a ring based off of the rings made by the Fidget ring comany. The ring can be worn on a finger or held in the hand and put in the pocket. The inside diameter of the ring is .75". The ring features a rotating ring on the inside with .125" pegs on it that a person who has difficulty sitting still will find very useful because it gives them something to do other than move around.

Stratasys

uPrint SE Plus

The ring is a little rough at first but you can either sand it or use it a lot and after a small while the rotating piece will move smoothly.

To design this I had to create it in 3 parts to make it be able to move after it was done finished printing. The ring has a large outside a smaller inside and the rotating ring is sandwiched between the two.