On OSX you just pick a regular printer, do all your normal setup, then under the printer setup set your ‘output options’ choose save as File, Format Postscript.
On OS9 under the printer setup, switch the ouput on the top right menu from printer, to file.
In Windows, not sure.
If it is windows, and it worked before but it isn’t now, maybe something happened to your driver for distiller under your printers.