There needs to be a button for the ribbon which allows clearing to the print range so it can be reset to another range.
This is already supported in Excel. To clear a print area
1. Click anywhere on the worksheet for which you want to clear the print area.
2. On the Page Layout tab, in the Page Setup group, click Clear Print Area.
You can see this visualized here: http://www.solveyourtech.com/how-clear-print-area-excel-2010/