It doesnt happen often ofcourse. It is super rare, but there are many horror storries on google. I think the biggest reason for fire hazard is a kitchen stove, still most people dont have any protection even there (including me).
These cans cost like 2-3 kg of filament and hopefully they will never be used and end up like a "waste of money". Im spending money on this hobby anyway and this upgrade might help me sleep better 😁
Sorry for anxiety my friend
My printer is behind shelly plug as well and I was thinking I could mount temperature sensor and smoke detector that shuts down printer through homeassistant and alarming me if needed. Testing and trusting that automation might be difficult tho. I do have camera as well, but that thing wouldnt help if shit happens while im in the deep sleep. Extinguisher would live on top of that.