Lexmark consistently tests its printers with recycled paper (20–100% post-consumer waste) and a variety of test paper from around the world, using chamber tests for different temperature and humidity conditions. Lexmark has found no reason to discourage the use of today's recycled office papers, but generally the following property guidelines apply to recycled paper.

Low moisture content (4–5%)

Suitable smoothness (100–200 Sheffield units)

Suitable sheet-to-sheet coefficient of friction (0.4–0.6)

Sufficient bending resistance in the direction of feed

Recycled paper, paper of lower weight (<60 gm2/16 lb bond) and/or lower caliper (<3.8 mils/0.1 mm), and paper that is cut grain-short for portrait (or short-edge) fed printers may have lower bending resistance than is required for reliable paper feeding. Before using these types of paper for laser (electrophotographic) printing, consult your paper supplier. Remember that these are general guidelines only and that paper meeting these guidelines may still cause paper feeding problems.

Using letterhead

Check with the manufacturer or vendor to determine whether the chosen preprinted letterhead is acceptable for laser printers.

Page orientation is important when printing on letterhead. Use the following sections to determine which direction to load the letterhead in each paper source:

Loading letterhead in the multipurpose feeder

Note: Place the letterhead facedown in the multipurpose feeder with the long edge of the paper entering the printer first.

Loading letterhead in the 520-sheet trays

Long-edge orientation

Without finisher

With finisher installed

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Lexmark X940E, X945E manual Using letterhead, Long-edge orientation, Without finisher With finisher installed