Device ports shift around after every reboot on Raspberry Pi 3

Hey all,

A really annoying problem I have with my install of RepServer on a Raspi 3 is that every time I reboot, the printers change order and connect to the WRONG printer. Really annoying since I think i am preheating one printer, when it's a totally different one.

I'm using device paths such as /dev/ttyUSB0 - /dev/ttyUSB2 while one is always on /dev/ttyACM0. Is there any way to "lock" these paths to the printer and keep the ports from shifting around? 


  • If you have several printers with same id you should use /dev/serial/by-path/... that it matters to which usb port the printer is connected. These are aliases to the names you have problems with but linux knows which one is which.
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