Sierpinski Pyramid as knotted edges of a tetrahedron. Depth-3 fractal recursion.

65mm bounding box; any smaller than this and edges start sticking together at the points where they come close to each other. Prints perfectly and feels amazing in Nylon PA12 SLS. Workable but fragile in MJF; try scale it up to more like an 80mm bounding box. Not suitable for FDM printing.

by Michael Kleber, license CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0/)