How to keep your printer toned
Just as I suspected, my color laser printer has been lying to me and saying it’s “out of toner” long before it is. This piece on Slate explains all — and how you can get extra mileage out of your toner.
(By the way, my suspicions had been aroused because 25 years ago I sold auto parts, and most auto sensors work precisely the same way: By going off at a prescribed time whether or not there’s something wrong with them. You might want to bear this in mind the next time you have a sensor light come on and the mechanic tells you you need a new EGR valve or thermo fan switch.)