@AlohaMilton i work at a resturant, and their firesupression system is pretty lame, aside from everything being stainless steel, they just have a heat trigger connected to water pipes above all common fire areas(stove, deep frier etc.). In the event of a fire the pipes open and spray the crap out of everything. They also have it hooked to manual switches that can be triggered from multiple areas in the building.
@AlohaMilton bruh! The fireplace! Why didnt i think of that we have atleast 4! Lol
@Cristian_Nicola just for the record and to emphasize this, never depend on safety functions in firmware unless you have configured and compiled it yourself. Lots of the cheap printers ship without thermal runaway protection enabled (my guess is to work around crappy thermal monitoring that would cause too many false positives).
Thankfully my Prusa i3 MK2S seems to have that enabled and ive tested it out by gripping the heatblock with pliers to pull away some heat and that triggered thermal runaway real quick lol
@foosel thats why i did say make sure your firmware does not have the checks disaled. i would add that adding a thermal fuse may also help
And ensuring that connectors and wiring are actually rated for the currents in question
@Cristian_Martinez did you also check for watchdog resets? in theory the board can get an error and leave the heater pins enabled. or better yet the mosfets can get broken and let current go full power … that will get the printer very very hot 
No lol
to be honest i am more worried about the fumes the printer makes when printing than i am about it catching fire. keep in mind the printer doesnt work with sparks and open flames - for plastic to get to flame it is not as easy as it seems - in the lack of some fuel like vapours from some hair spray it would take alot of time and smoke before actual flames. simple solution get an ip camera and set it to monitor the space over the printer - if there should be any smoke the camera will trigger the alarm. make sure you have a fire alarm for when you are sleeping. done! as safe as it gets well, make sure you have an anti electrical fire thinggie - keep in mind they expire so check the expiration date on it
I have a fire alarm sitting next to it and i keep an eye on it through octoprint while im at work lol. I only print with PLA so are there any hazardous fumes with that? I dont mess with ABS at all. Its all PLA and some PETG
even frying your bacon does create hazardous fumes the nice thing with the ip camera is that it will trigger an alarm when there is movement (ie smoke) detected. the ip camera movement alarm would trigger long before the fire alarm will start screaming…
@Anthony_Djekic_twans AWESOME! ill hang one over my printer lol
Put your printer in a CO2 filled enclosure
See i need a simple solution cant keep throwing money i dont have at that printer lol
RPI3, Camera, Alamode"arduino" with relay shield, hook to printer power for emergency on/off, also hook to small fire extinguisher, add temp sensor to outer area
if Temp = pfft
{
power = FALSE
co2 = TRUE
}
Also make sure to just make a feature for just power off, in case you start making spaghetti
In case of spaghetti i tell octoprint to abort lol
@Cristian_Martinez Some folks dont have wifi/internet controlled 3dPrinters
And I am a bit wary modding my printers internal wiring/prograaming the board.
Whereas plugging the printer into a plug connected to a relay controlled via Rpi/Alamode python app does the job.
Yeah i have my printer plugged to a pi. Id love to have the relay be a separate thing thou (if i went that route) so if the fire claims the pi the relay will still function