3D Guardian

3D Guardian is an ultimate 3D printer fire prevention device, with some extras.

The primary function of 3D Guardian is to constantly monitor the printer's environment, and to shut it down (sounding an alarm) if the environment moves beyond the trained range. In addition to the traditional sensors (temperature, smoke, CO), it has a unique feature - a heated bed resistance sensor, which constantly monitors the resistance (voltage and current) of the heated bed wiring. Problems with this wiring (bad connectors, broken wires) is probably the most common cause of 3D printer fires; all these issues will manifest themselves as an increased bed wiring resistance, and the printer will be shut down automatically way before the actual fire starts.

The secondary function of 3D Guardian is to control the exhaust system of the printer's enclosure. That includes operating the air inlet and outlet (with stepper motors), and PWM control of the exhaust fan.

The device can be operated directly