Brother DCP-8110DN Software User's Manual page 155

Printing and Faxing
Duplex Printing
 Automatic Duplex Printing
Select Layout.
Choose Long-edge binding or Short-edge binding in Two-Sided.
 Manual duplex
Select Paper Handling.
Choose Even Only and print, and then reload the printed paper into the tray (blank side face down in Tray
1 or Tray 2, or blank side face up in MP tray). Choose Odd Only and print.
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