Both extruder and bed_heater not heating at expected rate - suddenly

General Discussion
1

Basic Information:

Printer Model: 2 trees bluer
MCU / Printerboard: MKS Robin Nano v1.3
Host / SBC Opi 3 lts
klippy.log
klippy.log (4.2 MB)

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Describe your issue:

I have been getting the “extruder not heating at expected rate” after hundreds of hours printing.
First I tought I had some wire broken, so I changed the thermistor and heat cartridge.
But for my surprise, after changing everything and pid calibrating everything again, I got the same message while printing my first print.
I checked the klippy and found out that both, the extruder and the bed heater were turned off mid print.
Any clue why this is happening? Any tips on how to solve this?

2

As for the log, it’s only the extruder with that issue.
The bed runs fine.

The reason for this issue can be:

  • Loose connectors and/or wires.
  • A detached heater cartridge
  • A detached thermistor
  • A dying heater cartridge
  • A dying thermistor
  • A dying PSU (as long the bed runs on mains)
3

Have you checked the few last lines of the log? The bed also lost heat…

4

But there is no error message for this.

What you see is the error state of Klipper.

Temperature targets are high but heaters are shut off.

5

Ok. But if only the extruder has a hardware issue, why the bed also lost heat to ambiance temperature?

6

The bed temperature when the shutdown occurred was 61.0, and the only error is for your extruder. I’m not sure why you think the bed is a problem.

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7

If an error occurs, Klipper shuts down all heaters for safety reasons.

8

oh… i thought it would stop the log when the error occur.
Ok, thank you guys… I re-rewire everything. Its working now.

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9

Ok, despite my fault to understand that there was no error on both extruder and heat bed I found out what was my problem.
As I said i had just rewired everything. So I rewired everything again and again, I got the same problem.
I decided to watch what was happening while i was PID calibrating.
The weather here changed a lot this month and it got really cold. My part cooling fans are not very potent, so I never bothered to calibrate with them on.
I found out that if i attempt to PID calibrate with the part fan on, the verify_heater will trigger and with part fan off it will not trigger.
So I had to change the verify heater section and insert a “hysteresis: 20” to make a propper pid_calibrate on my extruder. After the PID calibrate was done, I saved the config and returned the hysteresis to the default value and done! My problem was solved.
Thank you for your time Eddy, jake and Sineos.

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10

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