When you click the print button after selecting a report to print you will get a pop up window like the one below. This will allow you to give the report a custom title that prints at the top of the page, and change the printer to something besides your default.

If you want a certain report to permanently print to a different printer then double click on the report name. One the first page of the wizard uncheck the box next to "Use Default Printer" this will give you the option to select a different printer to use with this report