A wire frame cube or hexahedron with 100 cubic cm "displacement" (enclosed volume). Most sets of Platonic solids are based on a constant edge length, these all have the same volume. The struts have a 3mm round cross section. The vertices are 3.6mm spheres.
This model is large, about the size of a tennis ball. The edge length is nearly 2 inches or 5 cm (the cube root of 100 cc is 4.64 cm). It makes a nice desk model or Christmas ornament.