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3D Printer USB-Serial Problems

Please Help. I have two Creality Ender 3 S1 Pro's that I purchased last month. Been playing around with one of them which is working fine. I have a Raspberry Pi running Octoprint (Octopi) and everything is working fine. So I decided to hook up the second one which does not connect to Octopi due to a USB problem. I've provided the output of 'lsusb' before and after plugging in the working printer and then show the successful connection as shown in /var/log/syslog. I then plug in the second printer that does not connect as shown with a tail of /var/log/syslog file. Any ideas/suggestions?

Thanks very much!

1) No Devices Plugged In

pi@octopi:~ $ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 008: ID 046d:082c Logitech, Inc. HD Webcam C615
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

2) Tail syslog and plug in Creality Ender 3 S1 Pro #1 (Working Fine)

pi@octopi:~ $ tail -f /var/log/syslog
May  7 12:43:36 octopi kernel: [  993.445602] usb 1-1.1: new full-speed USB device number 26 using xhci_hcd
May  7 12:43:36 octopi kernel: [  993.581707] usb 1-1.1: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
May  7 12:43:36 octopi kernel: [  993.581727] usb 1-1.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
May  7 12:43:36 octopi kernel: [  993.581742] usb 1-1.1: Product: USB Serial
May  7 12:43:36 octopi kernel: [  993.584617] ch341 1-1.1:1.0: ch341-uart converter detected
May  7 12:43:36 octopi kernel: [  993.589882] usb 1-1.1: ch341-uart converter now attached to ttyUSB0
May  7 12:43:36 octopi mtp-probe: checking bus 1, device 26: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1"
May  7 12:43:36 octopi mtp-probe: bus: 1, device: 26 was not an MTP device
May  7 12:43:36 octopi mtp-probe: checking bus 1, device 26: "/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1"
May  7 12:43:36 octopi mtp-probe: bus: 1, device: 26 was not an MTP device

3) Creality Ender 3 S1 Pro #1 shows up as Bus 001 Device 26

pi@octopi:~ $ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 008: ID 046d:082c Logitech, Inc. HD Webcam C615
Bus 001 Device 026: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


4) Plug in Creality Ender 3 S1 Pro #2 (Second Device) which is not recognised by Octopi

pi@octopi:~ $ tail -f /var/log/syslog
May  7 12:45:58 octopi kernel: [ 1135.286568] usb 1-1.1: new full-speed USB device number 27 using xhci_hcd
May  7 12:45:58 octopi kernel: [ 1135.386918] usb 1-1.1: device descriptor read/64, error -32
May  7 12:45:58 octopi kernel: [ 1135.606878] usb 1-1.1: device descriptor read/64, error -32
May  7 12:45:58 octopi kernel: [ 1135.826559] usb 1-1.1: new full-speed USB device number 28 using xhci_hcd
May  7 12:45:59 octopi kernel: [ 1135.926799] usb 1-1.1: device descriptor read/64, error -32
May  7 12:45:59 octopi kernel: [ 1136.146784] usb 1-1.1: device descriptor read/64, error -32
May  7 12:45:59 octopi kernel: [ 1136.267266] usb 1-1-port1: attempt power cycle
May  7 12:46:00 octopi kernel: [ 1136.926570] usb 1-1.1: new full-speed USB device number 29 using xhci_hcd
May  7 12:46:00 octopi kernel: [ 1136.926792] usb 1-1.1: Device not responding to setup address.
May  7 12:46:00 octopi kernel: [ 1137.146934] usb 1-1.1: Device not responding to setup address.
May  7 12:46:00 octopi kernel: [ 1137.366591] usb 1-1.1: device not accepting address 29, error -71
May  7 12:46:00 octopi kernel: [ 1137.466574] usb 1-1.1: new full-speed USB device number 30 using xhci_hcd
May  7 12:46:00 octopi kernel: [ 1137.466788] usb 1-1.1: Device not responding to setup address.
May  7 12:46:00 octopi kernel: [ 1137.686789] usb 1-1.1: Device not responding to setup address.
May  7 12:46:01 octopi kernel: [ 1137.906598] usb 1-1.1: device not accepting address 30, error -71

May 7 12:46:01 octopi kernel: [ 1137.907288] usb 1-1-port1: unable to enumerate USB device

Creality strikes again. Their printers are 1) very susceptible to EMI and 2) generate a lot of EMI.

I'd suggest that you swap the physical locations of the two printers and see if you have a problem printer or a problem location. Next, I'd look at the routing of wires inside both printers and make sure that the problem printer wiring is the same as the working wiring. In particular, check that the way the wires are routed is the same.

This forum is full of threads on Creality communication issues with quite a few suggested fixes and some successful fixes. Do a little searching and you should find them.

Try this