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I have an Ender 3 Pro with a Bigtree SKR board. I just replaced the entire hot end (thermistor, heating element, Micro Swiss hotend).

Now when I try to print a Benchy everything seems fine until maybe the 3rd or 4th layer. Then the PLA stops flowing so I stop the print and the temperature flies back up from 220 to 260 °C on its own (I do not want to print at 260 °C, I want to print at 220 °C). This makes me assume the PLA is stopping because the temperature is too hot.

What would cause this? Did I wreck the thermistor when I was putting it in? Is it a firmware issue? Why isn't runaway protection turning it off?

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  • $\begingroup$ You print PLA at 260°C? What did you modify? Did you install the proper firmware in swapping the hotend? Installing firmware is not optional. $\endgroup$ – Trish Oct 13 at 2:04
  • $\begingroup$ 210-230 is most likely ABS and not PLA. PLA is 190-210. $\endgroup$ – Trish Oct 13 at 2:10
  • $\begingroup$ The specs on the site you link read Print Temperature 190C - 220C Plate Temperature 60 - 80C Extruder Temperature 200C - 220C and are rather typical for PLA. the sticker 210-320 you quote however sounds ABS-y $\endgroup$ – Trish Oct 13 at 2:31
  • $\begingroup$ Let us continue this discussion in chat. $\endgroup$ – Jackie Oct 13 at 2:41
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    $\begingroup$ @Jackie And your target temp is 220° all along? Sounds like a wonky thermistor, or perhaps excessive part cooling / unisolated heater block / terrible PID tune. $\endgroup$ – towe Oct 13 at 9:17

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