Looks like my Raspberry Pi case sucks
Fan got loud again, so I tapped or slightly hit where the fan is, but on the outside of the case. No more noise. Apparently after a while, it gets too close to the case, and starts making noise.
Perhaps I should replace the entire case. Maybe there’s one on Amazon, that has a fan.
Or perhaps rig it, will hardened glue be enough to prevent it from touching it? And how long does it take for glue to dry? Leave the top off and disconnect the fan until the glue dries.
Perhaps something broke off when I blew air in it. You could get a 3D printer, and glue something onto it. Or 3D print a new case, that doesn’t have the problem. That would be the most expensive fix. But you’d have a 3D printer you don’t need.