When I designed this I didn't have my Bambu Lab printer with it's AMS; I had just and ender-3 S1 Pro (which didn't support filament changes) so this design is meant to be printed in 3 pieces and assembled.

Materials

Just about any material should be good, but you'll want to make sure you have good layer adhesion to make sure the loop doesn't break.

For strong assembly I have included cavities to place tooth picks into to reinforce it.

Either a paperclip or dedicated ornament hangers to hang them

glue to glue the pieces together. Super glue worked well for me

Printing

This design is designed to be printed without supports. Flip the bottom upside down and it'll print just fine. Refer to screen shot if you have any questions

Assembly

I start by cutting two toothpicks down to size and sticking them into the middle piece. A dab of glue on each end of the tooth picks and slide each end on. Hold in place for a few seconds and it should be good to hang up!