If Aristotle is not in use, within AppleShare you can assign a printer to a particular user. You also have the option to select a printer from the Chooser or to type the name. If the name chosen or typed in does not match the spooled printer's name, the printer won't be seen. We suggest verifying what the name of the printer for each user is.
You can set the folder privileges so the users have read-only rights. Do not give users the ability to make changes.