Printer not detected by OctoPrint

Get Help
1

What is the problem?

Can't connect to printer

What did you already try to solve it?

I've tried multiple cables (I don't think that's the problem, since I can control my printer using a windows pc with cura)

I've also verified that the printer is recognized by the computer. Here are the last few lines when I run dmesg:

Printer connected

[ 924.773499] ch341 1-8:1.0: ch341-uart converter detected
[ 924.774242] usb 1-8: ch341-uart converter now attached to ttyUSB0
[ 1312.634738] usb 1-8: USB disconnect, device number 5
[ 1312.635044] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[ 1312.635080] ch341 1-8:1.0: device disconnected
[ 1588.955125] usb 1-8: new full-speed USB device number 6 using xhci_hcd
[ 1589.104528] usb 1-8: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[ 1589.104540] usb 1-8: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 1589.104546] usb 1-8: Product: USB Serial
[ 1589.106064] ch341 1-8:1.0: ch341-uart converter detected
[ 1589.106552] usb 1-8: ch341-uart converter now attached to ttyUSB0
[ 1770.976358] usb 1-8: USB disconnect, device number 6
[ 1770.976769] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[ 1770.976807] ch341 1-8:1.0: device disconnected
[ 1919.307387] usb 1-8: new full-speed USB device number 7 using xhci_hcd
[ 1919.456733] usb 1-8: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[ 1919.456746] usb 1-8: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 1919.456752] usb 1-8: Product: USB Serial
[ 1919.459572] ch341 1-8:1.0: ch341-uart converter detected
[ 1919.460855] usb 1-8: ch341-uart converter now attached to ttyUSB0

Printer disconnected

[ 924.773499] ch341 1-8:1.0: ch341-uart converter detected
[ 924.774242] usb 1-8: ch341-uart converter now attached to ttyUSB0
[ 1312.634738] usb 1-8: USB disconnect, device number 5
[ 1312.635044] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[ 1312.635080] ch341 1-8:1.0: device disconnected
[ 1588.955125] usb 1-8: new full-speed USB device number 6 using xhci_hcd
[ 1589.104528] usb 1-8: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[ 1589.104540] usb 1-8: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 1589.104546] usb 1-8: Product: USB Serial
[ 1589.106064] ch341 1-8:1.0: ch341-uart converter detected
[ 1589.106552] usb 1-8: ch341-uart converter now attached to ttyUSB0
[ 1770.976358] usb 1-8: USB disconnect, device number 6
[ 1770.976769] ch341-uart ttyUSB0: ch341-uart converter now disconnected from ttyUSB0
[ 1770.976807] ch341 1-8:1.0: device disconnected

Systeminfo Bundle

octoprint-systeminfo-20230101194732.zip (78.9 KB)

Additional information about your setup

my setup:

  • Ender 3 pro with the 4.2.7 board
  • Marlin bugfix-2.1.x
  • Octoprint running on a computer with Ubuntu 22.04.1 LTS
  • Octoprint version 1.8.6
2

I think it is on Ubuntu 22.04 (or maybe 20.04, can't remember) that you have to disable/uninstall the brltty service for it to work.

Try sudo apt remove brltty, reboot and try connecting again?

3

Hey, thanks for the reply. brltty isn't installed on my computer, so that's not the problem.

4

What guide did you use to install OctoPrint on Ubuntu?

5

I used this.

1 Like
6

Allright, I feel kind of dumb. Turns out I just forgot to run these lines:
sudo usermod -a -G tty pi
sudo usermod -a -G dialout pi

2 Likes
7

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.