Using Epson Printer Utilities - Epson Stylus COLOR 600 User Manual

3. Type the paper size name in the New Paper Size box.
4. Specify the measurement unit as either inches or cm.
5. Type in the width and the height.
6. Click OK. You return to the Page Setup dialog box.
You can define up to eight paper sizes. The paper size names
you create will appear in the Paper Size menu in the Page
Setup dialog box.
To delete a custom paper size, click Customize in the Page
Setup dialog box, select its name from the list in the Custom
Paper dialog box, and click Delete.

Using EPSON Printer Utilities

EPSON printer utilities allow you to check the current printer
status and do some printer maintenance from your screen.
Click Utility in the Print dialog box to view the Utility dialog
box:
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Using the Printer Software for Macintosh