THIS HAS NOT YET BEEN PRINTED/TESTED I made a simple ornament puzzle piece. The holes in the sides are made for 5x3 mm magnets. When not on a tree, can fit together for display. I put family/pet names on them.

Magnets: https://www.amazon.com/gp/product/B0936M3WPK/ref=ox_sc_saved_image_1?smid=A3NKAP522IBO00&th=1