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-Paper with staples, clips, ribbons or tapes.
-Paper that has been used once by the copy machine or other laser printers. (The back
of that paper is also improper. However, note that you can use the paper delivery tray to
perform manual duplex printing on the reverse side of a sheet of paper that has already
been printed on using this printer. You cannot print on the same side of a sheet of paper
that has already been printed on.)
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Paper that is difficult for the toner to adhere to.
-Paper with rough surfaces such as rough paper and Japanese paper.
-Paper with special coating on its surface. (Coated paper for ink jet printers, etc.)
-Paper containing thick fibers.