Canon i-SENSYS LBP6670dn User Manual page 577

[Alternative Method]
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If this item is set to [On] and if the last page for the 2-sided printing is 1-sided
printing, 1-sided printing is applied to the last page. (Printing can be performed
faster than normal 2-sided printing.)
[Off],
[On]
However, when performing 2-sided printing on punched paper or previously
printed paper, the orientation or printing surface of the last page may differ from
other pages. In this case, specify [Off].