Octoprint doesn't detect printer in USB

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1

Hi everyone ! :slight_smile:

What is the problem?
My Octoprint on Raspberry pi3B+ doesn't detect the serial port of my Ender 3 anymore. It worked during several month without problem and stopped without any modification from my part.

What did you already try to solve it?
What i did to identify the problem :

  • Check the voltage on the raspberry pi : OK (>5v)
  • Change my usb cable to another : Same problem
  • Disable all plugins on Octoprint (safe mode) : Same problem
  • Reinstall Octopi : Same Problem
  • Tested usb port on Raspberry pi (with a usb key) : OK.

To ensure that the raspberry was not powering up the ender 3 I also added a piece of tape on the 5v usb port. I removed it to ensure it was not the problem. This lead me to a strange behavior :
When my printer is not powered ON and my raspberry pi is, I can connect to the serial port (with the tape removed). Then I power ON my printer and the connection stays (however i didn't tested this while printing). If my printer is powered ON before establishing the connection this does not work.
To disable the USB port voltage, I installed a plugin (https://github.com/OutsourcedGuru/OctoPrint-USBControl) but if I disable the 5v on USB after establishing the connection to my printer the connection is lost.

Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)
Logs on Octoprint :

Changing monitoring state from "Offline" to "Detecting serial port"
Serial port list: []
Changing monitoring state from "Detecting serial port" to "Error: Failed to autodetect serial port, please set it manually."
Failed to autodetect serial port, please set it manually.

Logs on raspberry pi (dmesg command) :

 3.319890] usb 1-1.2: new full-speed USB device number 4 using dwc_otg
usb 1-1.2: device descriptor read/64, error -32
usb 1-1.2: device descriptor read/64, error -32

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)
Printer : Ender 3, Firmware : Marlin 1.1.8
Raspberry pi 3B+ : Octopi 0.17.0, Octoprint 1.4.0

PS: English is not my native language. I hope I made this clear. Thanks for your reply !

2

Hello @Gebowunjo!

Have you tried to connect the printer to your PC and checked connectivity with Pronterface? Maybe the issue is on the printer side...

3

There is exactly the same behavior with pronterface on my computer. I can connect to the printer but only when the printer psu is off (and the 5v from the usb of my computer is powering up the printer).

4

Also I forgot to mention, but sometimes when I start my printer connected to my raspberry my front fan makes strange noises and is clearly not at full speed. Restarting the printer or reconnecting the raspberry resolve the problem. I don't know if it's related or not. I was going to replace the fan (thinking it was a fan problem).

5

I guess some fine filament strings are slowing down the fan. You might have to clean it.

6

I already did that. I changed my fan yesterday and it doesn't do strange things anymore. Meanwhile my main problem stays. I Can't connect to my printer correctly.

7

So you were right. I did change my printer motherboard and it did correct the problem. At least I changed it for a better version ^^.

2 Likes
8

Hi guys, if you have this kind of problems with the Fysetc S6 v1.2, I've written a guide to solve it.
https://www.hwtronics.com/2021/03/02/guide-fysetc-s6-v1-2-octoprint-fixing-usb-power-problem/

1 Like
9

Wow, so the problem was your motherboard printer usb port?,
I'm having same issue, and I dont understand why stop working,
I'm trying many diferent thing, maybe Marlin update and JyersUI , doesn't support well raspberry pi 3B+.
Any advice?. I don't have money to buy a new motherboard, is jut one moth i got this new printer