I have issues with momentarily temperature spikes, but only above 250 °C. At and below 250 °C it's pretty solid.

I'm using Prusa MK3s+ with a E3D Revo upgrade.

I suspected connector issues as described in Random hot-end temperature spikes but in my case, the reported temperature spikes up, then compensates down - exactly opposite to what Space Faring Or Bust reported. Also, my issue happens only at specific temperatures. Connectors on both ends of a cable look good. I don't recall it happening earlier, on my old V6 hotend.

A side question is, are these even real? Or just a read error or a display artifact?

I cut the connector off and re-crimped it, but it didn't help, it looks exactly as it did before.

Screenshot of Octoprint's temperature graph showing spikes for the hotend

  • $\begingroup$ Faulty sensor? Is your firmware using MPC or PID for nozzle temperature control? Is it (auto) tuned? $\endgroup$
    – Bob Ortiz
    Commented Jan 5 at 22:22
  • 1
    $\begingroup$ @BobOrtiz PID and it was tuned. I ordered new heater (revo uses heaters with built-in sensors) so I'll be able to try different one in a week or so. $\endgroup$
    – Mołot
    Commented Jan 5 at 22:39
  • $\begingroup$ Maybe far fetched and would probably give more issues but faulty power supply and power spikes? $\endgroup$
    – Bob Ortiz
    Commented Jan 5 at 22:42
  • $\begingroup$ I'd love to know how to test that. I don't have spares. It might make sense as it only happens with higher power consumption. $\endgroup$
    – Mołot
    Commented Jan 5 at 22:56


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