Difficulty understanding source of error

[nicegamer7]

Basic Information:

Printer Model: Ender 3 S1 Pro
MCU / Printerboard: STM32F401
Host / SBC: Raspberry Pi 3 Model B
klippy.log:
klippy.log (2.4 MB)

Describe your issue:

I recently set up Klipper on my friend’s printer, the one mentioned above. I’m new to 3D printing, but am experienced with SBCs and the other things required for running Klipper, and he’s very experienced with 3D printing.

We’re running into an issue where we’re unable to complete prints. We get through maybe two minutes, then Klipper shuts down due to thermal runaway protections.

Looking at the klippy.log file, I don’t see anything abnormal, it seems both the bed and the extruder reach their target temperatures and are held there.

We’ve done multiple PID tunes, but that hasn’t helped. I don’t think there’s anything wrong with the thermistor because the values seem correct and reasonable in the log.

My only guess is that we should run the PID tune with the fan on, which we haven’t done yet. Even that doesn’t quite seem right to me, since the temperatures seem correct in the log file.

Does anyone have any ideas?

[Sineos]

This rather looks like a communication problem. Shortly before the error message, the rto values jump, and the communication seems stalled.

You could look into the topics here: Timeout with MCU / Lost communication with MCU

[nicegamer7]

I found the following thread yesterday, the problem seems similar:

Another one! Heater extruder not heating at expected rate

Basic Information: Printer Model: ender 3 V2 MCU / Printerboard: creality 4.2.7 3 days of googling and i am at a loss. i get the error a few minutes into a print. tried a new thermistor and new heating element and still get the same error. it looks like my temps are stable so idk what the issue is and i am just at a loss. klippy.zip (3.2 MB)

I started looking into this possible communications issue. I bought a new power supply for the Raspberry Pi since we noticed a couple under voltage messages. I’m not sure if that will fix it, but I’ll go through the thread you linked and double check all the points. Thanks for the start, I’ll update here on what we find.

[nicegamer7]

We updated Klipper, it looks like the following commit probably fixes the erroneous error we were seeing:

heaters: Increase time before clearing the temperature of an inactive heater

I can’t say for sure though, we also swapped the Raspberry Pi power supply, and put electrical tape on the 5V pin in the USB cable. We’re no longer getting any errors (so far as least). Thanks for the help!