On the Printer control panel:
Settings
CR Movement (carriage return movement)
Set CR Movement to 'Data' to have the carriage move only as far as the image.
Set CR Movement to 'Machine' to have the carriage move the full width of the machine.
You might want 'Machine' to give you just a bit extra dry time between passes.
Works well when your profile dumps just a bit too much ink down at a time.
You can also set the 'Overwrite Wait' to delay the carriage at each end for much longer delays.
You can use 'Overwrite Cnt' (count) to multistike, lay down multiple passes for higher density (i.e. for backlit) and use the 'Overwrite Wait' for a couple of seconds to allow all that ink a chance to dry.
The RIP always overrides the settings on the front panel, so be sure and check settings in your rip as well.
Thanks to Kenna at Custom Sign Center in Cour d'Alene, Idaho for the question.