This project aims to improve the safety of 3D FDM Printers by adding an external MCU (an Arduino) which increases your chance of preventing or mitigating a fire at your home.
Safety Printer MCU assembly
The project itself is very simple and designed to be cheap (the minimum needed is an Arduino nano and a few sensors). All you need is some time to assemble everything and test.
This project has a sibling project, the Octoprint's Safety Printer plugin which is optional but it's highly recommended as it helps you monitor your sensors and helps a lot during test phase:
You can find lots of information on Wiki and we recommend it's reading.