MCU random disconets with bigger print files

General Discussion
1

Basic Information:

Printer Model: Ender 3 neo
MCU / Printerboard: original creality
Host / SBC: Dell optiplex 360, xUbuntu

klippy.log (4.2 MB)

Describe your issue:

(sorry for bad english)

my printer randomly disconects when i’m printing files that should take longer that 2h

i think i tried everything, changing cables, powersuply’s, linux from mint, debian to ubuntu, hhd for an ssd, beter grounding, chatGPT,

once i made an 8 hour print for a test without filament and it worked this one time

Zrzut ekranu 2025-12-27 140140
Zrzut ekranu 2025-12-27 1401401900×479 147 KB

any ideas?

2

Hello @radek !

Have you checked for backpowering (power from the SBC to the printer)?
Is there good ventilation/cooling of the driver components?
Have you checked for proper current settings of the drivers?

3

1)yes i removed power in the usb,

2)i’v put an aditional cooling

  1. what do you mean by that ?
4

You don’t use an SBC? U use a laptop (DELL) and you have the original controller board flashed with klippy firmware?

This would then mean yor laptop and printer are connected via USB cable.

Next time when it disconnects run “dmesg” in a terminal to see if the USB connection dropps.

I would also try another USB cable