Comment on Automatic Fire Extinguisher for 3D Printer Cabinet
FuglyDuck@lemmy.world 4 months agoIt was a significant problem in early machines. Most now have thermal runaway protection. As long as your wires don’t short out, it shouldn’t be a problem.
And the only wires that have enough energy to be a problem are the heaters- hot ends, heated beds/enclosures.
The firmware keeps track of how much energy is going to them and will shut the printer down if the energy is inconsistent with the reported temperatures. (Aka thermal runaway protection.)
You can also usually add secondary thermistors and if they deviate too much, triggers the same result. (And the machine will usually start trilling to get attention, etc,)
SzethFriendOfNimi@lemmy.world 4 months ago
The only other thing to worry about are mosfets failing in an ON state.
Not sure if it’s the same risk with SSR’s
FuglyDuck@lemmy.world 4 months ago
Eh. when was the last time a mosfet melted on anyone? not saying it can’t happen, but mosfets are at fairly reliable. as long as you’re not trying to push wayyy too much power through them; and also proper surge protection to avoid things like bad power in your house frying them.
SzethFriendOfNimi@lemmy.world 4 months ago
It’s not that they melt as much as they just keep dumping heat into the heater cartridge and wires.
And if failed in an on state thermal runaway isn’t going to stop it.
It’s relatively rare though. I’m not too worried about it but it’s one of the reasons I watch my printer and of course there’s thermal fuses for such occasions if you really needed it.
Damage@feddit.it 4 months ago
Ideally the heater shouldn’t be powerful enough to set itself on fire even at 100% power I guess.
For bed heaters there are thermal fuses.