And finally, the last of the set of models from my entry to the Makerbot Academy Math Manipulative Challenge on Thingiverse. This model shows that we can use the individual snap tiles to make non-convex polyhedra. Here is the stellated octahedron:
STL file: http://www.geekhaus.com/makerhome/day90_stellatedoctahedron.stl
Tinkercad link: https://tinkercad.com/things/i7RhQW0w6z6-tiles-for-stellated-octahedron
Thingiverse link: http://www.thingiverse.com/thing:185859
Settings: The tiles are optimized to work with the low/.3mm MakerWare setting on a Replicator 2.