Epson EPL-N3000 Reference Manual page 38

Slide the side paper guide outward while pinching the knob.
Then, slide the end paper guide while pinching the knob, to
accommodate the paper you are loading.
4. Load a stack of the desired media on the center of the cassette
with the printable surface facing up. Then slide the side paper
guide while pinching the knob until it is against the right side
of the stack to get a snug fit.
Paper Handling
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