Originally shared by Nicholas Seward
Internet points to those that can guess what this is an animation of.
Spherical object printing…guess 40% fill?
@Kenan_Ataerk Only one infill density?
Nooo, of course not 
there is like a polynomial one. On the edges is more like an 85, Centrum it’s 20… Or less?
@Kenan_Ataerk Have you seen infill that does this before? I would love a source if you could find one. This is cubic infill where the cubes that intersect the skin get subdivided recursively. https://github.com/Ultimaker/CuraEngine/issues/381
sierpinski infill?
@Justin_Nesselrotte It looks like triangles and hexagons but it is really just a cut through a bunch of cubes.
Reminds me of this http://through-the-interface.typepad.com/through_the_interface/2012/01/an-interesting-challenge-generating-variable-density-fill-patterns-for-3d-printing.html
I’ve been thinking for ages that having consistent I fill density through the whole interior is a waste. Nice to see what looks like a good linear-ish fill pattern algorithm for this.
These are fractals. This specific one can be used as a wifi antenna.
3D infill