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I've been using my octoprint just fine for a few years and just this week I keep getting "thermal runaway" errors on existing files I've been printing hundreds of times. the warning says your printers firmware detected a error with the printer but its not octoprints error (or something like that).
What did you already try to solve it? I tried printing multiple preexisting files all has the same issue, ive restarted the printer and the pi multiple times, I've deleted all the files stored in the pi and tried sending new files from Cura .. same problem, I've reflashed the firmware... same problem.... I've sliced a new file saved to disk and that worked normal. I've uploaded a file that I sliced and saved to desktop and went into octoprint and uploaded and that worked too.
however if I send a sliced file from Cura to octoprint and try to print it gets the heater timeout however the saved sd card tells me its not a printer problem but a octoprint problem.
im not a programmer, or like most of you on here... I struggle to get to this point so I really can use help.
I definitely want to thank both of you…. .. you both quickly pointed me in a direction that resolved the problem… my pid autotune values were all over the place.. so i opened it up… replaced the fan since it was old and possibly not spinning as fast as it should… i disassembled the hot end and cleaned it up and reassembled everything and redid the pid autotune a few times and just successfully made a simple flow test print without any issues.
This was a first for sure… 4 years, 2 printers and never ran into this problem before
My Creality Ender 3 with Octoprint gave the same error recently. In my case, it really did have thermal run away- the extruder thermistor gets loose after a while, then makes poor thermal contact with the extruder head. Solution is remove the thermistor, examine it and reinstall being sure the retaining screw over the wires is secure.
