Comment on Did Bambu Lab change something on the A1 recently?
JohnEdwa@sopuli.xyz 2 months agoI though we fixed thermal runaway firmware issues like a decade ago for good…
Comment on Did Bambu Lab change something on the A1 recently?
JohnEdwa@sopuli.xyz 2 months agoI though we fixed thermal runaway firmware issues like a decade ago for good…
ExcessShiv@lemmy.dbzer0.com 2 months ago
Not when the sensor fails so the feedback to the firmware controlling it is incorrect and there is no thermal fuse.
JohnEdwa@sopuli.xyz 2 months ago
Yes, even when the sensor fails.
If the feedback from the thermistor is either nonsense or doesn’t change as expected even when the heater is on/off for a certain time, that should trigger a thermal runaway error and halt the printer. That’s basic decade plus old Marlin code.
I’ve had two broken thermistors in my Ender 3. First one reported negative temperatures when it disconnected, so the printer immediately halted with a min temp error. The second reported something like 150C, which was in the acceptable range, except when it tried to heat it up and nothing changed for like 15 seconds, which triggered a halt.