Fred, I am not sure what you are asking?
Just coming in here to explain as Fred is out for a while.
What he want to know is:
The page size, and the print size, and how many prints on the page. Please him know the particulars including print placement type.
Also, how is the driver set within the Roll Paper settings?
With this information, Fred can reproduce your situation and thus work out why you have such large spaces betrween prints on the roll.
Hope that helps,
Terry.