No the person you replied to but I have the one from https://whambam3d.com/collections/fbs-for-resin and love it
boothin
Octoprint can only connect to 1 printer at a time, so if you want to use 2 printers at the same time you need 2 separate instances of octoprint. I use portainer so passing through a device is just a matter of finding the device path on the host machine and plugging its path into the portainer config under the runtime & resources tab. In a docker compose you'd use the devices key, for example
devices:
- /dev/ttyUSB1:/dev/ttyUSB1
You will likely need to create a separate alias for the host USB path though because devices can be found in a different order every reboot so the path will change. The USB device alias will be based on the device vendor and product id so it will be persistent. https://michaelgreenhill.net/persistent-addressing-for-usb-devices-in-linux/ is one site that explains the issue and how to deal with it
Luckily the S in USB stands for serial, so I have 3 printers connected to my server via USB and each one has its own octoprint docker container
The most important part of those instructions is usually to set it to half power