That sounds like a cool hack! Coffee grinders already have a motor and a bit of a shaft, so it’s a good base for a small saw. I’ve turned a broken toaster into a mini hotplate and used an old phone battery to power a tiny LED light in a paperclip frame. What’s the grinder’s motor speed like? You could add a blade holder or a quick‑release gear. Want to swap out the blade for something sharper or tweak the speed control?