A new and bizarre issue has emerged on my Linux Mint server that seems specific to my Ender 3 and OctoPrint. Every night at midnight, regardless of whether a print is running or not, the USB connection to the Ender fails and restarts. (See screenshot from my Telegram OctoPrint plugin.) I’ve tried setting usb.autosuspend to -1 in GRUB, but that doesn’t seem to help.

I’m completely stumped and could use some advice. The failures are far too scheduled and predictable to be a random hardware failure. A relevant chunk of /var/log/syslog is included below for reference.

May 5 00:00:03 borgcube systemd[1]: logrotate.service: Succeeded. May 5 00:00:03 borgcube systemd[1]: Finished Rotate log files. May 5 00:00:03 borgcube kernel: [93921.837884] usb 1-5.4: new full-speed USB device number 9 us ing xhci_hcd May 5 00:00:03 borgcube systemd[1]: man-db.service: Succeeded. May 5 00:00:03 borgcube systemd[1]: Finished Daily man-db regeneration. May 5 00:00:03 borgcube kernel: [93922.059024] usb 1-5.4: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.63 May 5 00:00:03 borgcube kernel: [93922.059026] usb 1-5.4: New USB device strings: Mfr=0, Produc t=2, SerialNumber=0 May 5 00:00:03 borgcube kernel: [93922.059027] usb 1-5.4: Product: USB2.0-Serial May 5 00:00:03 borgcube kernel: [93922.066323] ch341 1-5.4:1.0: ch341-uart converter detected May 5 00:00:03 borgcube kernel: [93922.066896] usb 1-5.4: ch341-uart converter now attached to ttyUSB0 May 5 00:00:03 borgcube mtp-probe: checking bus 1, device 9: "/sys/devices/pci0000:00/0000:00:1 4.0/usb1/1-5/1-5.4" May 5 00:00:03 borgcube mtp-probe: bus: 1, device: 9 was not an MTP device May 5 00:00:03 borgcube snapd[1104]: hotplug.go:200: hotplug device add event ignored, enable e xperimental.hotplug May 5 00:00:03 borgcube mtp-probe: checking bus 1, device 9: "/sys/devices/pci0000:00/0000:00:1 4.0/usb1/1-5/1-5.4" May 5 00:00:04 borgcube mtp-probe: bus: 1, device: 9 was not an MTP device

I think the answer is no, but I have an arlo security camera kicking around (arlo indoor essential camera). There's not a simple way to hack this into something that would work with octoprint is there?

The first bugfix release for the 1.9.0 version.

Changelog: https://github.com/OctoPrint/OctoPrint/releases/tag/1.9.1

The newest episode of OctoPrint On Air, which was recorded on June 15th

• OctoPrint 1.9.0
• The new camera stack
• Work towards 1.9.1 and 1.10.0
• Brainstorming on the format of OctoPrint on Air

Full contents with jump marks available in the YouTube description.

You can find all public past episodes in the OctoPrint On Air Playlist.