About this 3D model

Here are 5 pencil holders based on the Archimedean solids. They are constructed from just two elements, hypocycloids and spheres. Stl files are: icosidodecahedron.stl truncated_dodecahedron.stl truncated_icosahedron.stl rhombicosidodecahedron.stl and truncated_icosidodecahedron.stl. OpenSCAD code is included.