Unless you want to physically go to the printer and plug in a cable, you'll probably network it, not that it's a huge problem really because you have to go to it to collect the paper anyway.
Creating an isolated airgapped network for the printer means you have to disconnect from your existing network first.
Putting the printer into its own isolated VLAN with limited access from wherever your user devices are works, but is more complex to set up.
If you're operating a perimeter based security model where you rely on perimeter security rather than each individual host then any compromised device inside the perimeter can be a serious problem. A printer will have an embedded computer and there's nothing stopping an advanced attacker from loading new firmware containing additional functionality.