Triangular truncatoprismantiprismoid

The triangular truncatoprismantiprismoid is a convex isogonal polychoron that consists of 12 ditrigonal prisms, 12 ditrigonal trapezoprisms, and 18 rectangular trapezoprisms. 2 of each type of cells join at each vertex. It can be obtained as a hull of two opposite ditrigonal duoprisms. However, it cannot be made uniform.

This polychoron can be alternated into a snub triangular prismantiprismoid, which is also nonuniform.

Using the ratio method, the lowest possible ratio between the longest and shortest edges is 1:$$\frac{2+\sqrt6}{2}$$ ≈ 1:2.22474.

Vertex coordinates
The vertices of a triangular truncatoprismantiprismoid, assuming that the trapezoids have three equal edges of length 1, centered at the origin, are given by the Cartesian products of two identical ditrigons of length 1 and $$\frac{2+\sqrt6}{2}$$ along with their central inversions.