fractal inverse menger walls rework

This can be worn as a party hat by making strap holes on two sides.

There is also hollow version for strong vases for advanced printers.

There are some more of these on Ghee Beom's page on google warehouse, but after all afternoon of editing wrong vertices i had to rebuild it up from square one which was pretty easy using sketchup solid tools-union to join everything together.

it looks cooler if you multiply the z axis by 1.67, total model diameter is about 1020mm with cubes of 2mm.

in sketchup i copied the blocks together using union tool, then i used solid inspector for sketchup to check that it was registering as a solid object to wile adding together. i think that the small stl here actually needs the rectangle at the back erased and rewritten to be a solid object it was registering as only a group in properties.