Epson CX6500 Reference Manual page 173

If a paper jam occurs, see
Once the paper is reloaded, click Resume to print the inside
pages.
Once printing is complete, fold the sheets and bind them together using a stapler or other binding
method.
Folded booklet double-sided printing for Macintosh
Use the following steps to create a folded booklet as described in the beginning of this section.
Access the Page Setup dialog
box.
Accessing the Printer Software for Mac OS
9
Select a Paper Size
setting.
Select the Double-Sided Printing checkbox. Then, select the Folded Booklet
checkbox.
Click
Margins.
Paper Does Not Feed
[Top]
Correctly.