Fidget Ring 24.3 mm
thingiverse
It will print with the outside ring loosely attached. You'll either have to fidget with it for a while and it'll come loose, or get something to pick underneath with, I used a dentist pick. This is for my finger I am not sure the size but it is 24.3 mm across. Just scale it up or down to fit your finger, its a pretty fast print.
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