7 cubes in 1

The outer cube is 20 mm (0.8 in), the innermost cube is 1.7 mm (0.07 in). It's made of copper, with an analogue lathe machine (no CNC magic).

I have yet to encounter a cube with smaller size / more inner cubes, please contact me if you know of one.

The pictures are made of the same cube, the first one is for better measures, but the 7th cube you can only see on the second one.

I'll upload sharper pictures when the other camera's repaired.