Meissner tetrahedron

The Meissner Tetrahedron is a body with constant width. Search youtube to find videos showing this interesting shape in action. Although there are several models on Thingiverse already, this one uses OpenSCAD to show the steps in involved in transforming a Reuleaux tetrahedron by smoothing three of its edges.

I also included is an .STL split into two pieces for easier printing.

Thanks for looking!
Bob M