The file 'Triakis Truncated Tetrahedron – Diamond Structure 3D Printer Model' is (skp,stl) file type, size is 6.3MB.
You look at the structure of this thing (the crystal structure of diamond) and you get a visceral sense why diamonds are tough.
The smooth version should print just fine, the unsmoothed version is another story because of the unsupported horizontals.
TTT_pyramid.skp | 8.4MB | |
TTT_pyramid.stl | 15.7MB |