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3D Star/Omega Star
This one is really amazing, it’s made from only one square paper, by John Montroll. It takes a lot of precreasing (folding before doing anything) so it’s time consuming, but it’s not hard to do.
This one usually impresses a lot, since it requires only one piece of paper. I do these stars whenever I’m bored or need to kill some time.
After some requests I made another video which is a bit more clear.
Paper to use
One single square piece of paper.
Instructions