How do I make my printer more secure while connected via USB to my Airport?

So a neighbor (a friend, fortunately) accidentally installed my printer on her computer via the network (her computer showed it as a 'Bonjour' printer) and started printing stuff, even though my printer is connected to an encrypted Airport Extreme.
My printer (an old HP deskjet 5550) is connected via USB to my Airport Extreme, which has a WPA2 secure password protecting it. Also, the "Share this printer" box was unchecked in the printer utility.
The DSL lines for me and my 20 condo neighbors all convene in the basement somewhere into one or several master routers.
I'm concerned about this breach of security (obviously) and wondering about security of my iMac as well. The iMac is connected to the base station wirelessly and has the firewall set to 'Set access for specific services and apps'.
I figured if the Airport Extreme has the WPA2 password set (and no one else knows the password) that no one would be able to gain access to the printer that is wired to it, or the iMac that's wirelessly connected.
What am I missing? How did this happen? and what can I do to ensure my network isn't visible or vulnerable to my neighbors or others with bad intent?

are there settings in the airport utility that you can adjust to make it unshareable from the router?
The "bonjourness" of the access to your printer suggests that your firewall is probably doing its job.
If your DSL connection is connected to the WAN port on the AE then the folks on the DSL side of your set up should only be able to see things on your LAN that you've set for 'access from the internet'. e.g. allow access to my printer/disk/... from the internet.
For printers there's an airport utility setting 'share printers over ethernet WAN port' and 'advertise printers globally using bonjour'. How's that set?

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