Menger sponge with external support

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 h