Michael Sweet is great, as is CUPS
Years ago (OS 10.0 I think...) I was trying to get and old Epson FX-880 dot matrix printer working with OS X. I had been running it using some old classic software, which came with a USB to parallel cable, I wanted to avoid classic. There is a CUPS driver for the old dot matrix printers (several), but the driver had a problem, when I printed more than one page the next pages got more and more off line. I had a back and forth via email with Sweet, and we figured it out (you can see it all at the CUPS website), he was incredible. I'm probably the only person on the planet using the driver, but he responded right away and stayed with it until it was fixed. He deserves every penny.