[jggimi]

Please provide more information.

1. Confirm your network configuration. From your brief description, it "sounds" like your network might be:

   {internet} -- [router] --- [FBSD workstation]
                    |
                [printer]

   If that's the case, your printer is not "behind" your workstation and access from other network devices on your local network (including via radio, if your network has WiFi access) may be the source of the output. The Internet is a possible source, but less likely, as your router is 99.99999% likely to be configured to use Network Address Translation (NAT), and that should preclude access from the Internet.
2. What is the printer model number? From that we can determine what network protocols the printer supports. (Likely unrelated, in 2011, a security flaw with some HP printer models was publicized. Google for "HP printer security" for more information.)