Hello @miabbott and @jlebon ,
This is strange for me. With F34 Silverblue, I connected my Brother printer directly via USB to the PC and it automatically was installed as such. After reading this post, and since I had to install F35 due to HDD failure and was starting fresh, I hadn’t connected my printer yet, till this am. I decided to use the Lan switch to connect it in order to use it more freely with different devices. When I followed the “Add Printer” assist in “Settings” of Gnome, it came up with a generic text printer with no real functionality, and more specifically it no longer recognized it as a Brother printer. I searched for the appropriate driver in the database and selected it, but haven’t yet tested it. I noticed it is now the CUPS driver and not the Brother specific PS3 driver. [Edit - 10:28EDT] So, on either USB or via networking over lan, the printer prints garbage using the CUPS drivers for some reason. This wasn’t a problem with F34 for sure.
[Edit - 20211021-0840] So today on booting, the foomatic printer drivers were “found” to be needed for my printer (which was no longer connected). I’m going to try to print to it later, will update.
[Edit:20211022-11:04EDT] No luck printing, link to device address is automatically set to browse localhost:631. Guess I’m back to messing with CUPS (again after YEARS of no printing difficulty).