It might depend on why the font is “too small”. For example, a “small font” might be a misinterpretation of a portrait page rotated to landscape. A 132-char printline definition might be in effect even though only 72 characters are actually printed. The resulting page may be auto-rotated and give a smaller font appearance.
We solved this problem by using a workstation customizing object. Our printers are attached via TCP/IP – most with just an output queue description. The same workstation customizing object has given us good results on a variety of HP printers.
If you like, I could send you the section of code that applies to 132 character print line.