Same issue as everyone else.
Am able to AirPrint from my iPhone ( IOS 12.0 (16A5345f) to an AirPrint enabled Canon Printer ( pro-100)
Am also able to print a ‘Test Page’ to the Brother printern ( b/w laser ) from the Printers & Scanners System Preference Panel.
I am able to connect to the Brother printer via ‘Show Printer Webpage’.
Have reset the entire print system.
I did see another posting ( https://discussions.apple.com/thread/7370019 ) of the same error, but no fix ( from El Capitan ).
Seems odd to release a beta that breaks printing. I uderstand testing during betas, but this isn't an alpha release.
good luck to all.