System Administration Guide: Printing

lpfilter Printers Argument

A print filter normally can work with all printers that accept its output, so you can usually skip this part of the filter definition.

You might, however, have some printers that are inappropriate for the output that the filter produces. For example, you might want to dedicate one printer for fast turnaround, only sending files that require no filtering to that printer. Other printers of identical type can be used for files that need extensive filtering before they can be printed.