Icosahedron Joint

This shape is famously recognized as the D-20 dice and the basis for soccer balls (though often truncated—these joint ends effectively handle that for you).

To build a full icosahedron, you’ll need 12 of these joints and 30 equal lengths of 38mm x 38mm (2" x 2") wood.

Special thanks to Jaap Scherphuis for the invaluable help in calculating the precise angles: Link.

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