Truncated small prismatodecachoron

The truncated small prismatodecachoron or tispid is a convex isogonal polychoron that consists of 10 truncated tetrahedra, 20 truncated triangular prisms and 20 triangular antiprisms formed by truncating the small prismatodecachoron.

Using the ratio method, the lowest possible ratio between the longest and shortest edges is 1:$$\sqrt2$$ ≈ 1:1.41421.