Stellated octahedron - Estrella Octángula

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Here a 3D printable octahedron. The octahedron is a geometric compound form and is constructed from the union of two tetrahedra. The vertex arrangement of the two tetrahedra is shared by a cube. It also can be seen as an octahedron with tetrahedral pyramids on each face. In geometry, an octahedron is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.