Canon LBP3310 User Manual page 115

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3-38 Loading Paper in the Multi-purpose Tray
Spread the paper guides a little wider than the actual paper
width.
When loading envelopes, align them as follows.
● Place the stack of envelopes on a flat surface, flatten them to release
any remaining air, and be sure that the edges are pressed tightly.
CAUTION
When loading paper, take care not to cut your hands with the edges of the
paper.