
Within Airport Utility, we could have selected “Extend a wireless network” as the Network Mode, however because we rely on a wireless connection between the Extreme and Express, doing so has the potential of reducing throughput among Wi-Fi devices because of the resulting network overhead. Our iMac also connects wirelessly to the printer. This made the Express into a “wireless bridge” between the printer and the Extreme, allowing our iOS devices to see the AirPrint printer.

Within Airport Utility, click on the Airport Express to open its status window click on the Edit button, then the Wireless tab, and then select “Join a wireless network” within the Network Mode options. Because the AirPort Express was being repurposed, we reset it using what Apple refers to as a “Factory” or “Default Settings reset.” With the reset completed, the Express became visible within Airport Utility, showing a connection to the Extreme. AirPrint apparently will not work with a USB cable. Using an Ethernet cable, we connected an AirPort Express router (2012 model) to the printer to provide a Wi-Fi capability to the printer. With help from Apple Support, here is what became our solution. In our situation, we cannot run an Ethernet cable from our router (a 4th generation Airport Extreme) to either our iMac or printer. Using a USB cable it worked well with our iMac, but we also wanted to use AirPrint with our iOS devices. We have an AirPrint certified printer that does not have built-in Wi-Fi. I came across this discussion when looking for a solution to a similar problem. Do not understand why the printer also needs to connect wirelessly to the router to enable AirPrint. I underdstand ther is a lot AirPrint is wireless, b ut why can it not be wireless from the iPhone/iPad to the wireless router and then through the ethernet cable to hard wired printer ? It's all on the same network with proper IP addresses etc. Is there anyway for me to keep the printer "ethernet connected" through the wire and use AirPrint ? As soon as I plug in the Ethernet cable the WiFi of the printer shuts off and AirPrint does not function anymore. Only when I unplug the ethernet cable and connect the printer wirelessly (with poor reception) to the wireless network, I get AirPrint to work. I do not seem to be able to set up AirPrint when the printer is connected through the ethernet to the local network. The wireless router covers & connects everything (PCs, iPhones & iPads) in rest of the house. The printer is located in the basement office where there is poor wireless reception, and therefore connected with a wire (ethernet) to a wireless router one level up on the ground floor. Recently I bought an Officejet 6700 Premium e-All-in-One to serve all my PCs in the house and to use the AirPrint functionality for all the iPhones & iPads.
