Symmetric Spheroform Tetrahedron

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3633154.

"This is a REAL solid of constant width. It is built from a Reuleaux Tetrahedron with the edges replaced by a carefully constructed sphere sweep." - myxibrium

I have replaced the sphere sweep code with a directly calculated envelope polyhedron to speed things up a bit.

More information about this unique shape by Patrick Roberts