I make gimbal keychains for most holidays as a fun "business card." They're great small pieces that can easily show off some of the things you can do with 3D printing.
Here's the one I made for St. Patrick's Day!
This prints as one single piece and as an added bonus the raised name on the side works great for embossing and stamping.
PLA, 205C extruder, 45C bed, no support required.
Turn on cooling to help the gimbal pins not weld to the rings.