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Thermal Runaway
My Ender 3 went into thermal runaway today (I shut off power just in time) just before I started to print parts for my Rat Rig build. I checked the thermistor was in place post failure. I also had upgraded the mainboard a while back and has octoprint, and I think thermal runaway is enabled on both. I am going to replace the thermistor as well as update all firmware, octoprint, etc. I know my Ender 3 has needed some TLC for some time, but this isn't the first printer I've worked with to go into thermal runaway. But this lead me to a few questions, especially to add more protection to both this and the rat rig:
1. Are there any hardware solutions to stop thermal runaway? Something like a fuse in the heater line that could trip if too high current too long? Or a setup which uses a secondary thermistor and a relay to cut power to the heater over a maximum value?
2. Redundant thermistors and firmware solution - Any way to incorporate multiple thermistors and some kind of filter where if the error between the thermistors exceeds a certain amount to shut off the heater?
2.1 Some way to connect a smoke detector to a Pi which signals a relay to shut off or something?
3. Any other layers of protection hardware or software that are more than single fault tolerant to give better peace of mind?
1. Are there any hardware solutions to stop thermal runaway? Something like a fuse in the heater line that could trip if too high current too long? Or a setup which uses a secondary thermistor and a relay to cut power to the heater over a maximum value?
2. Redundant thermistors and firmware solution - Any way to incorporate multiple thermistors and some kind of filter where if the error between the thermistors exceeds a certain amount to shut off the heater?
2.1 Some way to connect a smoke detector to a Pi which signals a relay to shut off or something?
3. Any other layers of protection hardware or software that are more than single fault tolerant to give better peace of mind?
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