Cassette PF-D1 allows for generous, expandable paper capacity for the LBP712Cdn laser printer, so you can keep printing with limited interruptions. The LBP712Cdn holds up to 550 sheets in the standard cassette, and cassette PF-D1 holds up to 550 sheets. You can use up to 3 cassettes with LBP712Cdn, giving you up to a 2,300-sheet capacity (including the 100-sheet multipurpose tray capacity).