AirPrint on iOS 8 - don't believe the compatible printer model list
Some printers will not work with AirPrint any more with the iOS 8 update. Apple have informed me that they are not responsible for the reliability of the information shown on their website about AirPrint, which includes the compatible printer list. This makes AirPrint a really flakey technology - please check with the manufacturer before buying a printer that is claimed to be compatible according to Apple's website. All I can tell you for sure is that the Samsung C460W, shown on Apple's list as being compatible, no longer works with iOS8. I'm sure there are plenty of others.