This frame holds a single ring at its center. With the pin removed, a photo could also be displayed, using the back plate to hold it in place.

Printing:

Print all parts in the default orientation without supports. The surfaces of the frame and backplate touching the build plate are the fronts.

Assembly:

Insert pin in through the back side of the back plate. The hole is intentionally sized to provide a tight fit so it may need to be enlarged slightly. 

Snap the back plate into the frame, aligning it's two tabs around the frame's top latch. This prevents the back plate from rotating. The back plate should fit under each of the three latches.

All done! Hang a ring on the pin and enjoy.