Rhombic Dodecahedron Lattice
thingiverse
This is an octahedral framework constructed from catalan solid cells known as rhombic dodecahedra. It packs 3D space with no voids, similar to how hexagons fill 2D space without gaps. I failed to discover a lattice like this one so I decided to create my own model. The exterior vertices are slightly irregular but I couldn't find an efficient solution to refine them.
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