Ender 3v2 Disconnecting at random times

ryed · August 29, 2021, 2:31am

What is the problem?

Printer (Ender 3v2) disconnects at random times and seemingly no further detailed error messages in log (serilog nor octoprint)

I've tried various things. Multiple prints with different usb cables (I've added the black tape to the cable to block the power point) and using Octolapse's test mode (it fails in test mode as well) . Switched to safe mode and removed all other usb peripherals (webcam and a usb lamp) and the problem still happens.

So far I think through sheer luck I've been able to complete 1 print (a calibration cube and with peripherals attached and using Octolapse)

Octoprint Log Safemode

 2021-08-29 02:14:56,703 - octoprint.access.users - INFO - Logged in user: tnsai
 2021-08-29 02:14:56,862 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.8.0.2
 2021-08-29 02:14:57,330 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.8.0.2
 2021-08-29 02:14:57,398 - octoprint.server.util.flask - INFO - Passively logging in user tnsai from ::ffff:10.8.0.2
 2021-08-29 02:14:57,398 - octoprint.access.users - INFO - Logged in user: tnsai
 2021-08-29 02:14:57,962 - octoprint.server.util.sockjs - INFO - User tnsai logged in on the socket from client ::ffff:10.8.0.2
 2021-08-29 02:18:01,300 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.8.0.2
 2021-08-29 02:19:54,619 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.8.0.2
 2021-08-29 02:19:54,698 - octoprint.server.util.flask - INFO - Passively logging in user tnsai from ::ffff:10.8.0.2
 2021-08-29 02:19:54,699 - octoprint.access.users - INFO - Logged in user: tnsai
 2021-08-29 02:19:54,786 - octoprint.server.util.sockjs - INFO - User tnsai logged in on the socket from client ::ffff:10.8.0.2
 2021-08-29 02:20:08,275 - octoprint.server.heartbeat - INFO - Server heartbeat <3
 2021-08-29 02:23:34,559 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.8.0.2
 2021-08-29 02:27:32,783 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.8.0.2
 2021-08-29 02:27:32,864 - octoprint.server.util.flask - INFO - Passively logging in user tnsai from ::ffff:10.8.0.2
 2021-08-29 02:27:32,864 - octoprint.access.users - INFO - Logged in user: tnsai
 2021-08-29 02:27:32,949 - octoprint.server.util.sockjs - INFO - User tnsai logged in on the socket from client ::ffff:10.8.0.2
 2021-08-29 02:29:16,274 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.8.0.2
 2021-08-29 02:29:41,450 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.8.0.2
 2021-08-29 02:29:41,539 - octoprint.server.util.flask - INFO - Passively logging in user tnsai from ::ffff:10.8.0.2
 2021-08-29 02:29:41,540 - octoprint.access.users - INFO - Logged in user: tnsai
 2021-08-29 02:29:41,698 - octoprint.server.util.sockjs - INFO - User tnsai logged in on the socket from client ::ffff:10.8.0.2
 2021-08-29 02:30:37,299 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.8.0.2
 2021-08-29 02:35:08,275 - octoprint.server.heartbeat - INFO - Server heartbeat <3
 2021-08-29 02:48:41,373 - 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/comm.py", line 3860, in _readline
     ret = self._serial.readline()
   File "/home/pi/oprint/lib/python3.7/site-packages/octoprint/util/comm.py", line 6488, in readline
     c = self.read(1)
   File "/home/pi/oprint/lib/python3.7/site-packages/serial/serialposix.py", 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?)
 2021-08-29 02:48:41,417 - octoprint.util.comm - ERROR - Please see https://faq.octoprint.org/serialerror for possible reasons of this.

Serilog Safemode
serilog_safemode - Pastebin.com (only the last few lines as it's large)


 2021-08-29 02:48:41,417 - Unexpected error while reading serial port, please consult octoprint.log for details: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:3860
 2021-08-29 02:48:41,417 - Please see https://faq.octoprint.org/serialerror for possible reasons of this.
 2021-08-29 02:48:41,436 - Changing monitoring state from "Printing" to "Offline after error"
 2021-08-29 02:48:41,443 - Connection closed, closing down monitor

What did you already try to solve it?

Changed a couple of usb cables (sadly none have ferrite beads, ordered a few incoming), went into safe mode, removed all peripherals from Pi, added the black tape to block the power point on usb cable.

Have you tried running in safe mode?

Yes

Did running in safe mode solve the problem?

No

Systeminfo Bundle

You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
octoprint-systeminfo-20210829033754.zip (3.6 MB) (the serial and octoprint log in this zip is from after the issue occurred and i rebooted my pi back to normal mode)

These are the logs from when issue occurred :
serial_safe-mode_trimmed.log (1.5 KB)
octoprint_safe.log (49.7 KB)

Additional information about your setup

OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible

OctoPrint version : 1.6.1
Printer : Ender 3 v2
Firmware: Jyers/Marlin 1.3.5 (also same issues on 1.3.4)
Printer has BLTouch installed.
Webcam: Logitech c920
RaspberryPi : Model 4B (powered via Official Pi power adapter)

Also: are there any recommended brands of powered usb hubs to get?

b-morgan · September 1, 2021, 4:27pm

Creality printers are very susceptible to EMI / RFI from both outside and inside sources. A shielded USB cable helps, ferrite beads help, shorter cables help, and routing the cable(s) differently helps.

Cable routing applies to cables external to the printer and also cables inside the printer. There are multiple threads in this forum that describe what people have done to solve this problem.

ryed · September 1, 2021, 6:30pm

Hi, thanks for the tips.

Yeah by happy chance, I was just trying out one of the old micro usb cables I have from some older portable hdd cases for the past 3days. It was a really short cable, and I've been able to complete prints.

I've added ferrite beads to this cable too.. turns out the main issue I was having was that my cable was too long.

Going to try and see if the ferrite beads helps with some of the previous cables I used.

Thanks!

Jgray · March 15, 2022, 4:10pm

I have been running octoprint on my ender 3v2 for probably 2+ years.

I had ZERO issues for the first two years. I updated my octoprint before doing some prints yesterday and now for the first time have started running into connection issues. Zero changes to my setup besides updating Octoprint to the latest version.

Ewald_Ikemann · March 15, 2022, 4:35pm

Hello @Jgray !

For this thread is already solved , it's recommend to open a new one.

Amit_Sharma · August 17, 2023, 8:52am

I also had serial port disconnection issues with my Creality Ender3 v2 - used to happen when my APC UPS would switch back to mains on power resume - it got resolved by adding ferrite beads to the USB power cable as well as serial cable connected to 3DP.