Epson 3260 - Manual (Page 53)

Printing on Special Paper
In addition to printing on single sheets and continuous paper,
your printer can print on a wide variety of other paper types,
such as envelopes, labels, and multi-part forms.
Adjusting the paper-thickness lever
Before you print on special paper, you need to change the
paper-thickness setting for the paper you are using.
1. Remove the printer cover and set the paper-thickness lever to
match the thickness of your paper. Choose the setting from
the table below.
Note
If you
set the paper-thickness lever to 1 or 2, the print speed is
reduced.
Paper Handling 2-15