Menger Sponge 4th degree

Half of the cube allows to see a star pattern at the diagonal cut which is awesome.
When printed on this side no support is required! 
Printing of this part on MK4 of a size of the entire bed would take approx 3d 6h (0.2mm quality). And it's just half of the fractal.

I've attached my very old and small make for 3rd degree of this fractal (not a result from Prusa printer).