This is an atomic sturcture of rutile. The rutile-type structure is adopted by various dioxides, such as TiO2 (photocatalyst), GeO2, high-pressure SiO2, etc. in each octahedron, a cation atom (e.g. Ti) is located at the center and six oxygen atoms are at the vertices. By printing this model, you can understand the characteristics of rutile type-structure such as: The stl file is made by Blender with a self-made python script. This model was printed with a Cube 3 printer without automatic supporting materials.