Drilled Truncated Cube
This model is a truncated cube that has square
cupolaic excavations in two opposite octagonal faces, and is then drilled by a
central cube to create a hole through the model. It has
a genus of 1, ie it has one hole.
Here's the shape of the hole, inside a transparent truncated cube.
A cube in the middle (red), where 2 opposite faces have been augmented
with square cupolae (green).