A dodecahedron of Hopton Wood limestone, sawn on my Rubi bridge saw from a 75mm cube.
The head was set at 58.285 degrees (roughly), that is half the dihedral angle of a dodecahedron (the angle between two faces). 12 cuts later we have the finished shape. The last two cuts were not quite the right angle so off camera I ran the saw over those two faces again.