6 identical pieces are held together by 12 magnets to form each tetrahedron. Make 5 sets of pieces (30 total) from different colors and then weave them all together to make this beautiful object (6" across) which is the perfect intersection of five tetrahedra! Assembling one tetrahedron is a fun little puzzle to figure out the magnetic polarity, but weaving all five together is quite a tricky challenge in dexterity and spatial reasoning.
Generate "concentric" style support only where it touches the buildplate, with overhang angle set to 50-deg and no stair-stepping. See the close-up screen shot to see what the support is supposed to look like.
No infill needed! Coarse layer thickness is OK!
After you remove the support it can be helpful to "open up" the holes by hand so that the magnets slide in and out of the holes smoothly. The best way to do this is with a slightly oversized (0.126") gage pin, but you can also do a good job of it with the back side (blunt shaft end) of a 1/8" diameter drill bit. If you use the drill bit, put tape over the sharp pointy end so you don't cut your hands while working with it.
In order to assemble the whole puzzle, you will need 60 of these 1/8" diameter x 1/4" long neodymium magnets: