Canon LBP6680x E-Manual page 196

Multi-purpose tray
(2-sided printing)
*1
With [Paper Feed Method] set to [Speed Priority]
*2
With [Paper Feed Method] set to [Print Side Priority]
For details on [Paper Feed Method], see
Downloaded from ManualsPrinter.com Manuals
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(With the printing side face-down)
(With the front side face-down)
"[Setup] Menu ([User Maintenance]
manuals search engine
(With the printing side face-down)
(With the front side face-down)
Options)."