Even then - I have a reasonably nice Brother Printer/Scanner/etc device, and I could never get AirPrint to reliably work until I switched over to using Ethernet instead of Wi-Fi. Something to do with it going to sleep and not broadcasting the necessary mDNS stuff, IIRC. I couldn't find any combination of settings in the printer to make it happy, and since it's now right next to a switch, it's not really worth the effort of digging any further.