Epson STYLUS PRO 4400 Reference Manual page 230

When the same data is printed with a 3 mm margin and a 15 mm
margin and compared, you may notice that part of the right side
of the 15 mm margin image is not printed.
Area to be
Clipped
15mm
Right
PPR SIZE CHK
When you select ON, the printer stops printing if the width of paper
loaded in the printer does not match the data width. When you
select OFF, the printer continues to print even if the paper width
does not match the data, and the printer may print beyond the
paper.
Note:
When you load the paper using the manual feed slot, select ON.
PPR ALIGN CHK
When you select ON, if the paper is not straight, PAPER NOT
STRAIGHT appears on the LCD and the printer stops printing.
When you select OFF, a paper align error does not occur even if
the printed data is out of range of the paper, and the printer
continues to print.
230 The Control Panel
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Printable area
Leading edge
Bottom
15mm
Roll paper
Top
Print direction
15mm
15mm
Left