Last week I posted photos of some test folds of simple bent tubes. This design uses a series of eight bends to create a helix. I usually base my models on 16-sided tubes, but here I simplified to just 8 sides. Since the bends are all at different angles relative to the tube, the paper curves in three dimensions to approximate a helix instead of a flat doughnut. It’s interesting that a design like this with only straight folds can fold into such a curved-looking shape.
