Smoke detector - Savety shut down Printer

This is a project for every printer and every printer should have it. Also this here is more about the project then for the printing parts.
I read some stories the printer burns down or the electric burned out. To try to avoid a bigger damage as the printers most of the time are in
action without supervision, it's just a question of security to have a smoke detector on it.
This version is low cost and not too difficult to build - even for beginners.
Of course there are many stuff on it wha