Printing to plotter printers is not specifically supported in Spotfire, so there are no settings in the program to handle this functionality explicitly. The recommendation is to export the data to an image file, then print from a different program to get the desired output. Alternatively, you can print to a large .pdf (A0 size works best for resolution) and then print to the plotter from the .pdf application (like Adobe, etc). See
Printing for more details.