for making wrappers for tube notches…
Tube Coping Calculator
you punch in your 2 sizes of tube, angle that they join and any offset… then it spits out the pattern that you can print from a .pdf
handy for quick things you don’t want to model in cad. I mostly just used a chop saw to notch for my cage, but for some of the steep angle nodes, I used a wrapper so i could trace the notch and cut it with a grinder.