I’ve played quite a bit with ways to curve the axis of paper tubes, starting with simple pleats and extending to the crimp-bends that I used in my curved-neck vases and an assortment of geometrically distorted models. The crimp-bends have some advantages, but are a lot of work to set up for tubes with vertical pleats.
These test folds are a return to simpler pleats, testing how easily I can fold a series of pleats along the length of a tube. The first one is a test of changing the pleat axis along the length of the model, creating a slight helical twist.
The second keeps the same axis but changes in width along the length of the tube.
