>>623883
Thanks anon!
The menger sponge I got from here: http://origami.barcodebattler.co.uk/l1.htm

It's pretty sturdy, but it's mostly held together by compression, unlike the Torus >>623824 which you can pick up and throw around without it falling apart.
The main issue with the cube is that it's only really stable once it's fully complete so it's quite easy to fuck it up during construction.