A cube can be cut in half along a diagonal hexagon. When a Menger sponge is cut in half along the same diagonal, a new fractal emerges. The face is similar to a Sierpinski carpet, but with hexagrams instead.

The bar can be printed separately to hold two halves together. Challenge others to guess what the diagonal face looks like before showing.

The half cube can be printed without support. In fact, it would be a nightmare to try and remove support from a model like this.