Vent: dropped $260 on a corner rounder that chews through chipboard like a toddler, and my worst-worst lesson is not testing scrap first | Bookbinders - Opinions Matter
Scrap is cheap but time and materials aren't, so there's a limit to how much you can just shrug off. Learning from mistakes is fine, but if you keep burning through stock without changing anything, that's not a lesson, that's just a bad habit. The cost only counts as learning if you actually walk away knowing what went wrong.