From a tutorial on Friday, now I'm trying to make 3d forms first (rather than starting from 2d rectangular sheet of panel) in order to make this tecnique of folding in more articulaed way.
(last try was only folding of a single panel and angle of each fold wasn't even specified.)
A method is to divide cube into polyhedron.
In third sc shot, a cube was divided into 24 tetrahedrons.
Then delete some faces (a tetrahedron become open but still connect to others with a panel overlapping each other ) and make one continuous loop of panel.
I firstly tested with single volume then now I'm testing intersection of 2 volumes.