The Octahedron is one of the platonic solids described and studied by Plato and many others in ancient history.
Sankakkei Star Tetrahedron Seeds #M-size.
Size: ø 11 mm with ø 3 mm holes - The ‘Star Tetrahedron’ seed enables you to build the Tetrahedron, Octahedron, Star Tetrahedron, Vector Equilibrium, Isotropic Vector Matrix and the 64-Tetrahedron Cube or any other structure with tetrahedronal angles and axis.
Sankakkei Rods #White #M-size.
Size: ø 3.1 mm with a length of 6.7 cm.
Note: Although I'm very pleased with the service and quality Shapeways and 3D-printing has to offer, this is still a prototype product and will be perfected in factory production.