Shared by gibell on Thingiverse:
A seven piece puzzle which assembles into three sizes of tetrahedron. The essential piece is made out of 5 rhombic dodecahedra, and is available in two mirror picture variations (orange and yellow within the photographs). This piece is the “tetrahedron constructing block” (TBB). Straightforward: take one orange and one yellow TBB and construct a small tetrahedron (order three). Reasonable: take two orange and two yellow TBB’s and assemble a medium tetrahedron (order four). Tough(ish): take three orange and three yellow TBB’s, plus the crimson piece and assemble a big tetrahedron (order 5). All these puzzles have a novel resolution.
The weird formed items take some getting used to. However after you play with them some time, the three challenges will most likely not appear tough. The bottom plate is non-obligatory however might assist with studying how the items can pack.
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