Device reports readiness to read but returned no data

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1

What is the problem?
Printer stops printing, gives this error message and the print is failed. You know the drill.
'device reports readiness to read but returned no data '
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

What did you already try to solve it?
First i tried to google solutions and i have read your FAQ and i think i have taken every step i could find but nothing works.

Steps ive taken so far:

  • Replaced the power supply to a brand new 3.1A (no undervoltage)
  • Changed outlet for the power supply
  • Tried with and without the Pi cam - no difference
  • No other devices connected
  • Changed USB cable to a brand new shielded with a ferrite bead. USB cable is as far from printer as possible.
  • Tried to connect printer to different USB ports
  • No cables are loose
  • I changed the entire Pi3B+ mainboard to another Pi3B+
  • Reinstalled the OS on a brand new 16GB SD card
  • I moved the Pi further from the printer (aprox 1 meter away instead of next to it)
  • I have both tried an upgraded os and a fresh new reinstall from your website.
  • I have blocked the 5V pin on USB cable so it wont power the printer.
  • Tried the dwc_otg.speed=1 thingie, no difference.

Priting from SD card works great but i lack the remote control without octoprint :frowning:

Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
octoprint.log (65.6 KB)
serial.zip (1.7 MB)
serial log was too big so i had to zip it.

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)

Pi3B+, octoprint 0.17.0
Plugins used: Spaghetti Detective, Printoid (tried enabled/disabled)
Printer: Creality Ender 5 pro, stock hardware and firmware

I really dont know what to try next...

2

in the settings, under connection, there is a box for
Request exclusive access to the serial port
Check that box and see what happens

5

Im having the exact same issue on my wanhao I3 clone. No matter what Ive tried it falls over mid-print. SD print works without issue. Its a shame as I really like the thermal monitoring.

6

Any findings ? Having the same issue with my Ender 3 pro. Tried the same workarounds...

7

Well yes.. and no.

Unchecking the request exclusive access seems to work for now despite the fact you should have it checked. I have done maybe 15 long prints (10h+) without any trouble so far, but i guess i just jinxed it :smiley:

8

Just a random observation. The USB ports on most RPi boards share a single "channel" (not sure what the right name is) so serial communication with the printer and capturing images with a USB camera have to share it. I wonder if this is causing some kind of interference causing the serial communications to occasionally fail?