Since upgrade to 1.7.2 serial drops

What is the problem?

Since upgrading to 1.7.2 the Ender V2 will just randomly stop printing and sit there melting the part where it has stopped. I have just turned serial logging on so have no error logs yet. The octoprint screen just seems to sit at the point it got to with no error messages I can see.

What did you already try to solve it?

restart Pi

Have you tried running in safe mode?

safe mode?

Did running in safe mode solve the problem?


Systeminfo Bundle

You can download this in OctoPrint's System Information dialog ... no bundle, no support!)!AtM4Y6b8QGAqjMQZOeP3goSkmu9Kgg?e=6dxNho


Additional information about your setup

OctoPrint version 1.7.2, OctoPi version 0.17.0, printer Ender V2, firmware, browser Edge, operating system Win10 64, ... as much data as possible


Hello Stephen,

The underlined blue text is a link, it will open an explanation once you click on it.

I was surprised there was no octoprint.log in the bundle.
Does this happen while you print from sd-card?

I think the lack of octoprint.log is my fault, I deleted it and serial.log to get fresh ones after I realised I might have a problem. It prints fine from the SD card. I did two prints last night from it. I have had zero problems with this printer and octoprint since I got it a couple of years back.

Ok update, I managed to print 2 perfectly good items then it did the same on the third. I now have log files with errors in them!AtM4Y6b8QGAqjMQcOh0BhluqADEmWA?e=FrVa5D

octoprint.log actually hints at a faq entry next to the error:

2021-12-18 16:09:38,826 - octoprint.util.comm - ERROR - Unexpected error while reading from serial port
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python3.7/site-packages/octoprint/util/", line 3940, in _readline
    ret = self._serial.readline()
  File "/home/pi/oprint/lib/python3.7/site-packages/octoprint/util/", line 6605, in readline
    c =
  File "/home/pi/oprint/lib/python3.7/site-packages/serial/", line 596, in read
    'device reports readiness to read but returned no data '
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2021-12-18 16:09:38,836 - octoprint.util.comm - ERROR - Please see for possible reasons of this.

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