Print 12 of them and put them together to make a dodecahedron. Designed with the intention of adding 3mm plexiglass flat pentagons with mirror film to create an infinity mirror.
The fasteners click together in a satisfying way and hold strong. Once fully assembled it won't fall apart. It should be able to scale up decently, but haven't tested it.
Printed in PETG. Print it flat, no supports required.