Constant Width Tetrahedron .STL 99.9+% Accuracy

Description

**Tetrahedral solid with constant width 2.0** Following mathematical exact calculations by Patrick Roberts 2012. Still ugly mesh but with more than 99.9 % surface accuracy and a costant width of 1.000 +/- 0.1% from all directions. CC-SA-BY 4.0 Chris Langhans 2020.