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I recently started printing with an Ender 3 V2. I got a few good prints out of it, and then I have had nothing but issues.

Basically, I can start a print, and after about 10-15 minutes, the temperature will decline from 200 °C to 195 °C, triggering a thermal runaway alert, (low temp), and then cancel the print.

Here's an example of the hotend temp profile:

Screenshot of OctoPrint's temperature graph

I have tried testing the hotend thermistor, running PID autotune (multiple times, with up to 10 cycles), replacing the thermistor, running directly from an SD card (instead of OctoPrint).

Both thermistors worked, the first one read 108k Ω at room temp, and a new one is at 113.5k Ω at room temp.

I'm running firmware v1.0.4 on a stock v4.2.2 board.

One thing that did seem to save a print was that when I noticed the print temp dropping, I paused it for about 30 seconds and then resumed, and then the temp recovered up from 198-200 °C for a bit. But that's obviously not a solution.

I'm lost, don't know what else to test/calibrate, any ideas?

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    $\begingroup$ Could the temperature drop coincide with the model cooling fan coming on after the first layer? I'm wondering if you're running a 24V hotend on a 12V supply..? Or that the hotend heater has a problem. $\endgroup$
    – BobT
    Mar 27 at 15:52
  • $\begingroup$ looks like your code tells the printer to turn off - the light colored lines indicate that. OOOr, of course, layer end and airstream from the part cooling fan hitting the hotend. $\endgroup$
    – Trish
    Mar 27 at 18:02

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Well, this was a setup error. I am amazed it worked at all, but the reason this was happening was that the power supply was set to 230 V from the factory.

I am in the US, so the household current is 115 V. Once I switched the voltage, the printer has been very reliable, and I am not seeing heat drop-offs anymore!

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