Epson 4500 - Manual (Page 72)

Printing on Special Paper
In addition to printing on single sheets and continuous paper, your
printer can also print on a wide variety of paper types, including
multi-part forms, labels, and envelopes.
Before printing on special types of paper, you need to change the paper
thickness setting.
WARNING:
When printing on multi-part forms, labels, or
envelopes, make sure that your application program settings
keep the printing entirely within the printable area.
For multi-part forms and labels you should not print any
closer than one-half inch from either side of the paper.
For information on the printable area for envelopes, see page
2-31.
The Paper Thickness Lever
To accommodate various thicknesses of paper, your printer is equipped
with a paper thickness lever that can be set to eight positions. These
positions are identified by a scale on the printer next to the lever. (See
the chart on page 2-26.)
2-24 Paper Handling