Epson 300 - Manual (Page 40)

Setting the Paper Thickness and Adjust Levers
Before you start printing on special paper, you may need to
change the paper thickness lever and the adjust lever settings.
Note:
When changing these settings, make sure the printer is paused and no
paper is in the sheet feeder or the paper path.
Setting the paper thickness lever
The paper thickness lever has two settings: plain paper and
thick paper. You should set the lever to the position that best
suits the media you plan to use for printing, as shown in the
table below.
Lever Position Paper Type
Plain paper Standard paper, coated paper,
transparencies, glossy paper/film
Thick paper Envelopes, index cards, self adhesive sheets,
photo paper
thick paper
plain paper
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L
Hudson++ Ref. Guide
Rev.d
A5 size Chapter 4
04-16-98 DR, pass 1
4-2 Printing on Special Paper