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I have an Ender 3 v2 that will fluctuate the hotend temperature every 10 minutes or so and eventually causing thermal runaway. I have tried the PID auto-tune a few times and it seems to solve it for a couple of days. Any idea what’s going on?

Screenshot of OctoPrint's temperature graph

Today I ran the PID auto-tune again a few times trying to figure out the issue. Now when I heat the hotend to 220 °C it holds perfectly for about 15 minutes then drops and goes into thermal runaway shutdown. I heated the hotend while the printer was not printing to eliminate a bad electrical connection as the issue. Is this maybe a thermistor issue?

scott lafoy
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1 Answers1

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It turns out this was the beginning of the hot end thermistor failing. I took the opportunity to upgrade to an all metal hot end. That was the start of a nightmare that lead to the failure of my mainboard. But it is working now and no temp issues after several months and many prints.

scott lafoy
  • 131
  • 3