Parametric nesting fidget cube

This fidget cube is like a box that contain another fidget cube inside:
http://www.thingiverse.com/thing:2169371

It's 2 fidgets in one.

Size of blocks is 20mm.

When printed all hinges should be moved carefully. Once it starts move it wil be OK.
Ears on top hinges are weakest part, be carefull with it at the beginning.
Bottom hinges are the hardest part to start moving.