Canon EOS 5D - Manual (Page 142)

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When you print directly from your camera to your printer, the printing
settings will be saved in your camera. To use the same settings again,
follow the steps below.
1
Connect the camera to a printer
and prepare for printing.
2
Playback the images and select
the ones to be printed.
3
Press the <l> button that lights
in blue.
X The blue lamp will blink and printing
will start.
Easy Printing
With Easy Printing, only one print can be printed each time.
With Easy Printing, any cropping (trimming) will not be applied.
With C.Fn-18-1, printing will not be possible with the <l> button.