It's a 3D projection of a 4D hypercube. The outer edges are 4mm thick, the inner ones are 2mm thick, and the diagonal edges that connect the outer and the inner cube go from 2mm to 4 mm. The cube is 4cmx4cmx4cm
I left the materials that can hold the thickness of the smaller walls.
4.016 w x
4.008 d x
1.581 w x
1.578 d x