A Perfect Herschel enneahedron

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This polyhedron was created by Christian Perfect (hence the name) as a three-dimensional representation of the Herschel graph, named after Alexander Stewart Herschel (hence the other name). The math behind the graph and the polyhedron is explained in a detailed article on Aperiodical. Instructions The included STL file makes an enneahedron the same size as the paper model from the original article. You can change the overall length of the model with the size parameter, and the proportion with the stretch parameter. Setting stretch = 1 produces an enneahedron with the largest sides square; in that shape it prints easily with no support.