Brother MFC-J6510DW Software User's Manual page 126

Printing and Faxing
(Mac OS X 10.5.x to 10.6.x)
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For more page setup options, click the disclosure triangle beside the Printer drop-down list.
To do borderless printing
From the Paper Size drop-down list, choose the size of paper you want to print such as Letter (Borderless).
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