Epson AcuLaser C8600 Reference Manual page 41

2. Press down on the metal plate in the cassette until it clicks into
place.
3. Press on the side and back paper guides, to slide them
outward.
4. Fan a stack of paper and tap the edge of the stack.
Note:
If your printouts are curled or do not stack properly when using
plain paper, try turning the stack over and reloading it.
Paper Handling
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