thermal runaway errors
Hello, I have been having this issue for a while now. 3 weeks ago I replaced both hotend and bed thermisters and was able to print fine until yesterday where every print I tried resulted in a beep and a thermal runaway error about 30 minutes in. I've tried 4 or 5 different prints and all died at around the same time in. First time I found the error was when I came home from work to hear the fans spinning loudly and bed and hot end temps at 23 degrees. this also happened the next 3 times i tried printing and got thermal runaway, however the next 2 times I tried printing the fans just shut off after the beep and error. Ive checked to make sure the thermisters are snug, the bed and hotend both heat up normally, ive also noticed ive been getting mintemp bed errors every so often when heating up to print. at this point I'm at a loss as to what to do next. is the fact that the prints seem to go for roughly the same amount of time before erroring out an indication of another problem?
RE: thermal runaway errors
I also have this sometimes with PETG (not with PLA).
The solution that works for me many times is to print the parts off-center. My theory is that the fans of the extruder sometimes seem to cool the bed too much and the bed temperature sensor is at the center.
RE: thermal runaway errors
Hello,I had the same problem, I obviously solved the situation by adjusting the fan setting of the PLA filament with the values of the PETG:
Fan always on
Automatic cooling
Speed min: 30%, max: 50%
Disable fan for the first 3 layers
Max Fan for Layer 5
ThresholdsEnable if layer print time is less than 20s
Slow down: 15s
Minimum speed: 15mm/s
I haven't had any problems with PLA since.
RE: thermal runaway errors
You have different types of thermal runaway and the solution depends on the type of problem, for example you could have a thermal runaway even where the nozzle gets too hot, or you could have an event where the nozzle gets too cold. You can have the same for the bed, the bed could get too hot or the bed could get too cold.
When I update my I3 Mk2 to a Mk2.5s I had problems with certain types of prints where the fan would cool the nozzle too much and cause an event. Initially I solve the problem by adjusting the part cooling fan speed. My permanent fix was to put a silicon sock on the heat block which allowed me to keep the part cooling fan at high speed.
Before a solution can be suggested we need to know which kind of thermal runaway you're dealing with.
Cheers
-Bob
Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit
RE: thermal runaway errors
I haven't logged in for quite some time, and started to answer this, and then noticed that it's 8 months old. So I hope it's been solved.
All of that said... in general when I read a post that starts with "I just replaced XXX, and now I'm having related issues..." I usually assume that the issue is related to the replaced part.
But, since it's been so long, have you actually managed to fix this? Out of curiosity, what was the problem?
If not... has the problem remained the same, or is it continuing to shift?
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In theory, there is no difference between theory and practice. In practice, there is. -Yogi Berra
RE: thermal runaway errors
Bonjour,
Finalement j’ai changé toute la partie chauffage de la hotend (nozzle, heatbreak, heaterblock, heatsink, thermistor, PTFE), passage des tests et réglage PID tout marche à merveille. C’est repartie pour les 5 prochaines années.
Je pense que mon problème était dû à un hotend chargé de filament, j’aurais peut être dû faire un réglage de PID, mais une remise à neuf tous les 5 ans c’est pas mal.
Merci de votre attention et je vous souhaite une bonne fin d’année.
Bien cordialement.