Issue:
On a new install of Ubuntu 18.04 at work, it was adding every printer it discovered. Every time I tried deleting the printers, it kept re-adding them.
Open this file:
/etc/avahi/avahi-daemon.conf
Add this line:
enable-dbus=no
Solution found here:
https://askubuntu.com/questions/996020/cannot-stop-network-printers-are-being-automatically-added