Six strange pieces twist together to form a perfect Rhombicuboctahedron. It's a somewhat simple puzzle, but the abstract shapes, unique movements, and order of assembly might throw you off!

All parts print without supports, but there are some fairly steep overhangs. I printed at 0.12mm layer height, and 5 perimeters/shells, since there are some thin sections as well. No force is required for assembly!

The grey version shown in the photos was printed at 75% scale, and the clearances were still good, but I wouldn't go smaller.

Photographed model was printed with Polymaker PolyTerra Matte PLA (on Amazon)