The icosahedron is a polyhedron with twenty triangular faces created in Blender as an icosaphere with 1 division and 4-cm radius. The longitudinal axis intersects the icosahedron at two of the 12 vertices. A Boolean modifier was used to truncate the icosahedron with a plane to improve bed adhesion and manufacturability. A second Boolean difference modifier was used to create a 7/8-in hole for the wooden dowel.