Brother MFC J6910DW - Manual (Page 135)

Printing and Faxing
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Advanced Duplex Settings
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Some types of print media may need more drying time when using the duplex feature. Change
Advanced Duplex Settings if you have problems with smudged duplex prints or paper jams.
 Normal
Choose Normal to print at normal speed, using a normal amount of ink.
 Duplex 1 (Slower print speed)
Choose Duplex 1 to print at a slower speed, using a normal amount of ink.
 Duplex 2 (Slower print speed & less ink)
Choose Duplex 2 to print the same speed as using Duplex 1, but using less ink.
Note
Duplex 1 (Slower print speed) is not available for Ledger or A3 size paper.
Other Print Options
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You can choose the Paper Thickness and Bi-Directional Printing settings.
 Paper Thickness
You can choose Paper Thickness from Regular, Thick and Envelope.
 Bi-Directional Printing
When Bi-Directional Printing is checked, the print head prints in both directions offering faster print
speeds. When unchecked, the print head will only print in one direction giving higher quality printouts, but
slower printing speeds.