Building the elastic big cube

Thanks to the tests I did last year to find out how to pass the thread into the tubes to assemble the cube leaving enough freedom to the structure to fluctuate and move in the empty space of the scaffolding, I used the paper tubes and the elastic thread.

But after I made the first big one, with the longest length I could get from the rolled paper sheets which is 30 cm, I saw that I haven't kept in mind the force of the gravity: the structure once build had assumed enough weight to stretch more only the vertical thread when the structure lays hanged.

I discover I should have tied the elastic thread tight enough to not let the structure loose once it would have been hanged.