I have changed to a Canon MG6350 for frustration free printing!
I struggled with the HP Officejet 6700 Premium e-All-in-One Printer for 7 months before I finally decided that I had enough. It is stupid beyond belief that to print using wi-fi or Air Print on my Mac products that I had to turn the printer on to get it out of the economy mode before printing, many lengthy conversations with HP technical staff had me pulling my hair out, Excellent service from Amazon who agreed to replace with an Epson WorkForce WF-2530WF Ultra compact and reliable 4-in-1 for the small office printer with Wifi and AirPrint. Same problem, unable to re-ignite from economy mode. This printer went back within 24 hours for a refund.
So I decided to try yet another and this is my final choice Canon PIXMA MG6350 All-In-One Colour Printer (Print, Copy, Scan, Wi Fi and Airprint) White. Easy to set up and change the eco setting to always on - it closes everything down but leaves the wi-fi and Air Print link open so this morning, not having used the printer for 18 hours I could still print immediately from my Mac Book Pro, iPad and iPhone.
As a bonus it prints wonderful 6 x 4 colour photos from the upper paper cassette. You will need to top up the A4 more frequently as it only holds 100 sheets, but, Hey! everything else is brilliant.