Once these tools are installed, you simply need to adjust your printcap one more time. Add an if key to point to the Magicfilter that goes with your printer:

lp|The EPSON Stylus Color 777 sitting under my desk:\
        :if=/usr/share/magicfilter/StylusColor-777@720dpi-filter:\
        :gqfilter:\
        :lp=/dev/usb/lp0:\
        :sd=/var/spool/lpd/lp:\
        :pl#66:\
        :pw#80:\
        :pc#150:\
        :mx#0:\
        :sh:

There are filters for dozens and dozens of different printers and printer settings in /usr/share/magicfilter, so be sure you use the right one for your printer. Each of these filters is a text file, and usually the full name of the printer is at the top. This may help you if the file name of the filter isn't clear.

I also added a gqfilter flag to this printcap entry, which will cause the input filter to be used even when the print job is coming from a remote client. This only works with LPRng.

Since I set up the /var/spool/lpd/lp print spool directory earlier, I only need to check my printcap syntax and restart the server:

# checkpc -f
# /etc/init.d/lprng restart

Now you are able to print all sorts of documents, including Postscript files. In other words, choosing "Print" from a menu in your favorite web browser should now work.