Uses leaf springs for folding net of cube from flat plywood.
1) I used 3mm birch plywood, and cut out the net on the lasercutter.
2) folding is simple and a flexible cube results. I was going to use this as a lampshade, but many 3D models can be based on these techniques.
I made a number of variants, with fewer leaf springs (it is very springy as given), and with cutouts on the faces.