Ha. My second printer is a DD ender 3 pro, I made a little clasp that holds cotton wool and clips around the filament so it cleans it as it goes into the head. It’s surprising how much dirt ends up in the wool. Anyway if it snaps overnight the clasp yeets off in a random direction and is waiting for me on the print bed in the morning. As my octoprint doesn’t have great night vision it being missing is the only way I can tell the filament has snapped. 🙂