Mami's Soul Gem
by Subzerofusion, published
Mami's soul gem from Puella Magi Madoka Magica. You too can own a soul gem becoming a "mahou shoujo" like Mami by forming a contract with Kyubey. Which will eventually lead to your demise, turning you into a witch... or... you could print your own.
The universe wants YOU to overcome entropy, so what do you say? Contract?
Print both sides of the soul gem
Glue both sides of the soul gem together with glue of your choice
Paint to suit your preferences
Print the unprintable one... I've been told you can actually print it