Simple Auto-off addon for any printer

Hi all. This is my first contribution to the Thingiverse comunity and I hope you find it interesting and useful.

Since my first prints the need of turning off my printer manually once the piece is finished always bothered me. After almost a year tinkering with my printer I finally decided to do something about that.

I know that the fast answer is Arduino, but it comes with some issues like "I have to find 9Vdc" or "I don't want to waste a board with such a simple task". The good thing abo