THERMAL RUNAWAY DETECTION NOT WORKING
I have three MK3S+ and a Caribou. All of them running 3.11 firmware. I print abs in a closed chamber at 55°C. Once a while, when a print starts I see some white smoke from the tip of the nozzle, so I inmediately reset the printer. Apparently there is a thermal runaway, but the firmware doesn't detect it, so the hotend temperature rises to the limit of the cartridge (I'm guessing almost 400C, maybe less), so white smoke appears. The first few times I get that problem when I press the knob to start a print, it does the 9 point leveling and then smoke comes out. But, last time, it happened during printing, the hotend suddenly lifted, the last layer seems burned, and then the extruders were frozen in their last position with constant beeping from the LCD while white smoke filled the chamber. I freaked out so inmediately turned it off without seeing if the LCD shows me some error. In the Caribou (with EINSY RAMBO), the first time detected a thermal runaway, so I reset it and then does not detected it (white smoke again). So I think it is a firmware problem. Some day, it happens to me after a filament run out detection, I changed the filament and white smoke when a the print starts. I think that in total there have been about 10 failures in all my machines (about 1000 hours printing in each machine, all with 3.11 firmware). In my Caribou, when smoke appears, some time the LCD temp show about 300°C and then suddenly goes back to 255°C (but real temp remains 300°C) So, apparently is a firmware problem, not a thermistor problem. I know that the new firmware 3.12 has been realeased so I'll update all of them, but I just wanna hear from other users if that is a common problem or if it has something to do with my enclosure. I think that a firmware is never bulletproof, and every fixed problem could lead to new ones.