Octroprint doesnt work after upgrading ender 3 pro with a btt skr mini e3 v3 mainboard

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1

Errors:
No serial port found, are you sure your printer is physically connected and supported? Try [refreshing](javascript:void(0)) and if that doesn't help please see the FAQ.

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

What is the problem? I upgraded my ender 3 pro with an btt skr mini e3 v3 and touch screen LCD. Since then Octoprint cannot see the printer.

What did you already try to solve it? I have tested the connection and have pretty much nailed it down to the mainboard not broadcasting over the serial port. (I cannot connect to it using other software besides octoprint). So i know it is not technically an octoprint issue but am hoping that someone has some ideas. I have tried several cables including the one that was working prior to the mainboard upgrade. Double checked that the baudrate is the same in the octoprint website and firmware.

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, what kind of hardware precisely, ...)
Octoprint Version 1.9.0
Firmware: Marlin bugfix-2.1x

2

Let's check if the Pi detects the printer at all.

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

If you need help with ssh connection, follow this guide

username: pi
password: raspberry

3

Thank you PrintedWeezl ,
Below are the results.

OctoPrint version : 1.9.0
OctoPi version : 0.18.0

pi@octopi:~ $ dmesg | tail -n 20
[157817.990340] usb 1-1.1: device descriptor read/64, error -32
[157818.210062] usb 1-1.1: new low-speed USB device number 15 using xhci_hcd
[157818.310335] usb 1-1.1: device descriptor read/64, error -32
[157818.530344] usb 1-1.1: device descriptor read/64, error -32
[157818.650653] usb 1-1-port1: attempt power cycle
[171916.640473] usb 1-1.1: new low-speed USB device number 17 using xhci_hcd
[171916.740741] usb 1-1.1: device descriptor read/64, error -32
[171916.960695] usb 1-1.1: device descriptor read/64, error -32
[171917.180480] usb 1-1.1: new low-speed USB device number 18 using xhci_hcd
[171917.280706] usb 1-1.1: device descriptor read/64, error -32
[171917.500703] usb 1-1.1: device descriptor read/64, error -32
[171917.620876] usb 1-1-port1: attempt power cycle
[237205.927639] usb 1-1.1: new full-speed USB device number 20 using xhci_hcd
[242370.984701] usb 1-1.1: new full-speed USB device number 21 using xhci_hcd
[242371.122281] usb 1-1.1: New USB device found, idVendor=0483, idProduct=5740, bcdDevice= 0.00
[242371.122298] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[242371.122313] usb 1-1.1: Product: MARLIN_STM32G0B1RE CDC in FS Mode
[242371.122327] usb 1-1.1: Manufacturer: STMicroelectronics
[242371.122341] usb 1-1.1: SerialNumber: 20703159574B
[242371.136351] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device

4

pi@octopi:~ $ dmesg | tail -n 20
[171917.180480] usb 1-1.1: new low-speed USB device number 18 using xhci_hcd
[171917.280706] usb 1-1.1: device descriptor read/64, error -32
[171917.500703] usb 1-1.1: device descriptor read/64, error -32
[171917.620876] usb 1-1-port1: attempt power cycle
[237205.927639] usb 1-1.1: new full-speed USB device number 20 using xhci_hcd
[242370.984701] usb 1-1.1: new full-speed USB device number 21 using xhci_hcd
[242371.122281] usb 1-1.1: New USB device found, idVendor=0483, idProduct=5740, bcdDevice= 0.00
[242371.122298] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[242371.122313] usb 1-1.1: Product: MARLIN_STM32G0B1RE CDC in FS Mode
[242371.122327] usb 1-1.1: Manufacturer: STMicroelectronics
[242371.122341] usb 1-1.1: SerialNumber: 20703159574B
[242371.136351] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device
[244833.760514] usb 1-1.1: USB disconnect, device number 21
[244835.086275] usb 1-1.1: new low-speed USB device number 22 using xhci_hcd
[244835.186578] usb 1-1.1: device descriptor read/64, error -32
[244835.406515] usb 1-1.1: device descriptor read/64, error -32
[244835.626292] usb 1-1.1: new low-speed USB device number 23 using xhci_hcd
[244835.726595] usb 1-1.1: device descriptor read/64, error -32
[244835.946515] usb 1-1.1: device descriptor read/64, error -32
[244836.066655] usb 1-1-port1: attempt power cycle

5

You might have a voltage issue between the printer and the pi.

The link below explains better.

Put tape on the 5V pin - Why and how - Get Help / FAQ - OctoPrint Community Forum

6

:arrow_up: that and just to be sure - the printer is powered on, right?

7

Yes, the printer is on and i am able to print using a USB drive.

8

Thank you for the suggestion jattie but that did not help it connect.

9

I bought a brand new cable that definitely transfers data and that did not help.

10

I ended up buying another SKR Mini E3 V3.0 board as well as re-installed Octoprint. Neither of those helped.