Epson AcuLaser C8600 Reference Manual page 51

For Windows, access the printer driver, then select
User-Defined Size from the Paper Size list on the Basic
Settings menu. In the User Defined Paper Size dialog box,
adjust the Paper Width, Paper Length, and Unit settings to
match your custom paper. Then click OK and your custom
paper size will be saved.
For Macintosh, access the printer driver, click Custom Size in
the Paper Setting dialog box. Then click New, adjust the Paper
Width, Paper Length, and Margin settings to match your
custom paper. Then enter the setting's name, and click OK to
save your custom paper size.
Access the control panel for Printing Menu and set the
setting to (custom).
Paper Handling
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