With Drop-PS you can transmit text files containing PostScript commands to any AppleTalk-connected PostScript printer.
Drop-PS is a PostScript downloader.

To send a file, folder full of files, or disk full of files, simply drop it onto the DPS application or an alias to the application. You can also drop multiple files, folders, or disks at once.

DPS does its work independently of any installed printer drivers, so you don't need to have the LaserWriter driver installed.

Completly freeware.