Mac the Knife,
The only time you are going to see the shares is if you have the computer or printer in the DMZ. As long as you have them behind your hardware firewall, the internet should not be able to see them.
I run several print servers behind my firewalls at work and at home. They cannot be seen or accessed from the net. If you want to run a check of your system's security, run:
Gibson Research Corporation's Shields Up
Take Care,
Richard