Why does my printer not work when i plug in the internet? (ethernet)

hey guys,
i have the Mac connected to a large digital printer via the ethernet connection. works fine, no problems untill i plug in the internet. I get an error message in my software and can't print any jobs, but the internet works fine.
I have a feeling that its a network problem, but don't want to mess around too much with the settings.
This is a company internet connection.
if anyone could advise of the possible network settings, I would be very greatful.
thanks again.

Your Mac sends traffic to the interface at the top of the list in
System Preferences > Network
When you plug in the second Ethernet, that Interface jumps to the top of the list and all traffic goes there.
The solution is to cable that Printer to your Router, not to your Mac.
Alternatively, you could add a small Switch and connect your Mac and the printer to it.
If you really want to you can use Internet Sharing to add the Ethernet port going to the Printer to the Network connacted to the Internet.

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