Hey Dan,
I don't have your printer, but irregardless,
most printers have a setting to allow for portrait or landscape
orientation. In the X3 print dialogue window, right next to where
you've selected your printer in the drop down list, is the button
marked PROPERTIES. Click that and it should open to allow you
choose landscape orientation. As long as your document is
landscape, and this setting is selected, it should work.
The
only other option would be to set the default settings for your printer
in the windows printer folder to landscape, as that is your primary
print function.
Hope some of this info helps,
*cheers*
Todd