Epson SureColor P400 User Manual page 160

Cut sheets - normal printing
1 Top and side margins: 0.12 inch (3 mm) minimum
2 Top/reduced print quality area: 1.30 inches (33 mm) minimum
3 Bottom/reduced print quality area: 1.42 inches (36 mm) minimum
Note: Poster board margins are 0.79 inch (20 mm).
Cut sheets - borderless printing
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