Yes

@l43a2 ... I have a situation where PaperCut is on a PC server that is connected to a printer and a specific organisations network. 

However, two other organisations also share this printer, and I'm wondering how the primary network is isolated from these other users.

Can they see the primary network at all, viz. desktops, drives, internet etc?

in that kind of situation you may need to look into how its configured, i could assume how its setup but i would be completely wrong.

I'm a Papercut user, so not involved in the IT/server side of things, but do run the administration side within our office.

I do know that with our configuration it is completely locked down such that the only computers who can access our printer are ones who have a specific email address on our domain.  I presume that means with your configuration the other organisations would need access to the main domain/server and have their own email accounts within that original domain.  We pushed our supplier for a solution to allow third parties to use the printer (clients, guests in the office for the day) and were told this wasn't possible, which was of course very frustrating.  Not sure if that's a papercut thing, or the supplier being useless.  Probably both.