I can add printers to the docker, but they are not broadcasted or accessible by any device on the network
OK I've just run up the VM again and added my network printer to cups.
In my W10 workstation if go into File Manager and select network, then no the printer is not displayed there under the VM, but; Settings -> Devices -> Add Printer the printer is there
however during the setup on cups I selected the printer to be driverless