Ender 3 V2 no detected by octoprint

Tantor20 · January 4, 2022, 3:01am

What is the problem?

My problem is that my ender 3 V2 printer is not connecting to octoprint and it gives me the error message:

State: Offline after error
No more candidates to test, and no working port / baudrate combination detected.

What did you already try to fix it?

Test various usb cables from different devices

Logs

Changing monitoring state from "Offline" to "Detecting serial connection"
Performing autodetection with 0 port / baudrate candidates:
Changing monitoring state from "Detecting serial connection" to "Error"
Changing monitoring state from "Error" to "Offline after error"

Additional information

When performing an LSUSB, the system detects the printer with one of the usb but octoprint does not

Additional information about your configuration

OctoPrint v1.7.2
Open media vault
Ender 3 V2
4.2.2 Creality motherboard

PrintedWeezl · January 4, 2022, 10:44am

The printer is probably drawing too much power via usb.

Log into your pi via ssh then disconnect your printer, connect it again, enter dmesg | tail -n 20 and post the output here.

Tantor20 · January 4, 2022, 10:55am

hello @PrintedWeezl

post the output to dmesg | tail -n 20 and lsusb
Captura

The QinHeng Electronics think is Ender 3 V2
lsusb

PrintedWeezl · January 4, 2022, 10:58am

It's definitely detected and should be reachable under ttyUSB0.

Try this plugin

Tantor20 · January 4, 2022, 11:03am

Nothing, still not connecting, I have installed the add-on but still not making the connection

PrintedWeezl · January 4, 2022, 11:09am

Wait a second - I just noticed the lsusb output.
I thought you're using a Pi with an Octopi image.

Did you add the Octoprint user to the tty and dialout group?

sudo usermod -a -G tty <username>
sudo usermod -a -G dialout <username>

Tantor20 · January 4, 2022, 11:25am

Yes, I just added the two lines and I have restarted octoprint and the server but it still does not connect

I am using a laptop with openmediavault and docker, I have listed the users of the system and I have added all the ones that I thought could be and nothing

specifically root, admin and openmediavault-webgui

Charlie_Powell · January 4, 2022, 11:55am

How have you installed OctoPrint? Using the official docker container or something else?

PrintedWeezl · January 4, 2022, 11:55am

Ok but which user using is running the Octoprint server? It might be none of those users.
How did you install it?

Tantor20 · January 4, 2022, 11:59am

i am using this container

https://hub.docker.com/r/octoprint/octoprint#octoprint-docker

Tantor20 · January 4, 2022, 12:00pm

lo instalé utilizando portainer.io con el docker-compose

PrintedWeezl · January 4, 2022, 12:05pm

make sure you got

     devices:
      - /dev/ttyUSB0:/dev/ttyUSB0

in the docker-compose.yml

Check out this example if you need help with the file

github.com

OctoPrint/octoprint-docker/blob/9f7b4227228de98a180e122d6b666b0a5f61e906/docker-compose.yml

version: '2.4'

services:
  octoprint:
    image: octoprint/octoprint
    restart: unless-stopped
    ports:
      - 80:80
    # devices:
    # use `python -m serial.tools.miniterm` to see what the name is of the printer
    #  - /dev/ttyACM0:/dev/ttyACM0
    #  - /dev/video0:/dev/video0
    volumes:
     - octoprint:/octoprint
    # uncomment the lines below to ensure camera streaming is enabled when
    # you add a video device
    #environment:
    #  - ENABLE_MJPG_STREAMER=true
  
  ####

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Tantor20 · January 4, 2022, 12:12pm

OMG I forgot to uncomment the line of devices ...

Thank you very much for the help, I will try to be more careful next time XD

nwg24 · February 1, 2023, 8:04pm

hopefully this helps someone, if you are using portainer to manage your containers.
You have to add /dev/ttyUSB0 as a new device in Runtime & Resources.

After this the pi was able to make the connection to the printer.