MBP Retina "wake for wifi network access" while on battery power?

I have USB printer connected to Airport Express, and i can print from iPhone using "Printopia" while MBP on, but cannot print when the lid is close (sleep mode) & unplugged, so is there any way to activated "wake for wifi network access" while on battery power? Thanx...

Hi,
I am coming from the MacBook faction, but there were similar posts in there, regarding at least your picture#2, the vertical colored lines.
The consensus was (and I cannot write from own experience here, just relaying the message) that this has something to do with system parameters. To rewrite these parameters, one has to set a different screen resolution than the current one and save the settings and then go back to the old resolution again and save the settings as well. We were told, this would prevent the colored vertical line issue, at least for the MacBook.
Worth a try, it is easy enough to do.
Regards,
Woelund

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