After a while, my Brother MVC 9840 CDW printer (which I installed using this method) disappeared.
No idea why. So I deleted it and reinstalled it. When I went to reinstall it, the original IP-address method wasn’t available. Instead I picked: Network Printer -> Brother MFC-9840CDW and accepted the host and queue as filled in by the configuration dialog. When I did that, no luck.
Instead, I selected AppleTalk/HP Jet Direct since I knew the printer supported that protocol as well. Then I had to enter the IP address of the printer and accepted the default port (9100). Once that was done, I could again print a test page and use up all my ink.