The work printer nearest me apparently changed IP addresses. I had no idea, so I kept trying to print and it kept failing. Eventually, I noticed that my Mac thought the printer was on one IP, and the printer had a different one.
So I figured, no biggie, I’ll change the IP address.
Turns out, that’s a lot harder than it seems. I finally found this article which walked me through the steps.
Net-net: Apple needs to make this process much easier. I shouldn’t have to log into a hidden web interface to change the settings on a printer.