Patterson's 12 Piece Cube

Twelve identical pieces can be assembled into a 6 cm cube.  This puzzle appears (virtually) on the cover of Cubism For Fun, Issue #117, March 2022.  Thanks to Bruce Patterson who designed this puzzle for giving me permission to post it here.

Print 3 pieces in 4 colors.  Printing each piece is tricky, in the given orientation one face plus an edge lie against the bed.  The problem is that the edge is so thin that no material is extruded in it until the 5th layer.  Even adding supports, no supports appear under this edge.  I added a support enforcer and brim to force supports under the edge.  This works, although sometimes the edge will separate and curl upward because it has such small contact with the plate.

Assembly may appear to require 12 hands and coordinate motion!  But play with the pieces, assembly is not that difficult.  There are several additional challenges around the colors on each face.  Try to assemble each face so that it contains all 4 colors.  This can be done so that colors match across an edge, or not (see photos).  When assembled, you will notice that there is a hollow rhombic dodecahedron inside, a clue to how this puzzle was designed.