UMP45 Oath Ring

The inner diameter is 19.2mm, so scale it to fit your finger.

The picture was printed with a .6 nozzle on .12 layer height.
The outer detail prints perfectly fine on most nozzles, the inner text will need a tiny nozzle or SLA/DLP/other forms of 3D printing to create

EDIT 09/12/19: Added no text version