I have thought a lot about this in the past since I am always printing big prints.

My printer has smoked for me before without lighting up... Definitely think a smoke detector right on the printer is bare minimum safety consideration. It will at least give you a chance to check issues prior to a large fire. But obviously won't catch all issues. I have a regular battery operated smoke detector mounted on my printer. I have been thinking I should hook directly to my printer to short the board if it goes off (which would then cut power). Thought about adding thermistors, but so many potential power sources....

I like this product better because it is more robust by cutting off the power source on a separate system. Seems like it would be reasonably easy to make yourself but the price also seems reasonable.

My frame is a combo of wood and aluminum so definitely has me thinking... Good article!