I’m starting to get a hang of Fusion 360, and after many false starts I got my first project working, a parametric box design so I can put our scrap cardboard to use:
0.1" cardboard there. The folds were cut at 500/75%, and I’ll dial the power down a bit next time to keep more meat on the corners–that was just starting to cut into the bottom ply. 500/full power was perfect for doing the outline cutout. I’ll probably also make the tabs a hair longer, too. They hold, but just barely.