About this 3D model

The [Menger sponge] is quite difficult to print on a standard filament-based 3D printer; it's full of overhangs. Internal support won't work because it can't be removed, which leaves nice Menger sponge prints in the domain of other 3D printing technologies. [Menger sponge]: http://en.wikipedia.org/wiki/Menger_sponge On the other hand, the shape prints just great on the diagonal, as a few people [have noted]. That means it would be possible to print a sponge on the [diagonal] and glue the halves together, but that seems like cheating. [diagonal]: http://www.thingiverse.com/thing:234989 [have noted]: http://makerhome.blogspot.com/2014/01/day-155-menger-slice.html If you could print the sponge standing on a corner that would be fine, but it would certainly fall over within a few layers. I tried a couple of times to use automatically generated support from different software packages, but they all insisted on trying to support the interior holes that don't need it. Then I was inspired by another design that allows you to print a seemingly unprintable object, a [Moebius strip], by using external support that came as part of the original model and was broken off after printing. This design is the result, and so far it seems to work pretty well. [Moebius strip]: http://www.thingiverse.com/thing:230960