Menger Sponge (Levels 0-4)

Your standard issue [Menger sponges](https://en.wikipedia.org/wiki/Menger_sponge)! I was inspired by [this video](https://www.youtube.com/watch?v=8pj8_zjelDo) from standupmaths to see how easy it was to draw up. Attached are the resulting .STLs for a level 0 (no holes) through 4 (316 holes per face) sponge. I managed to piece together a level 5 sponge STL with Solidworks, which you can find [here](https://grabcad.com/library/menger-sponges-1) on GrabCAD.

First upload and time on this site, hope this all works properly.