MCU lost communication

General Discussion
1

Basic Information:

Printer Model: VZbot
MCU / Printerboard: Pi 4B 4gb(128GB samsung pro SD) + octopus pro h723
klippy.log
klippy.zip (1.3 MB)

Describe your issue: Randomly I get an error, communication with MCU lost. This stands out

“Traceback (most recent call last):
File “/home/admin/klipper/klippy/gcode.py”, line 459, in _respond_raw
os.write(self.fd, (msg+”\n").encode())
BlockingIOError: [Errno 11] Resource temporarily unavailable"

Ive tried reinstalling the PI os after formatting the SD, replacing all 3 PSU, replacing the USB cables, checked all wires, replaced octopus pro.

2

Your error actually is:

b'Got EOF when reading from device'
Timeout with MCU 'mcu' (eventtime=27791.026172)

See Timeout with MCU / Lost communication with MCU
Unfortunately an ugly error to get rid of, but in all cases I’m aware and all cases that have been successfully solved here it was related to hardware instabilities.

Also remove other USB devices that you might have connected.

1 Like
3

Thank you, I’ll read through that and try a print without my usb webcam attached. I do notice often my webcam will say it has lost signal so perhapes that could indeed be related.

4

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