Depends on the printer. I still remember the LaserJet 4000 series with great fondness. They were absolute tanks that almost never broke. You did have to replace wear items like rollers, but that was it.

Arguably it still hasn't matured yet. Or at least it's nowhere near to be a solved problem and we'll probably sidestep it before ever coming up with a real solution.

I'd put it in the same bucket as TODO lists. After centuries we're still not set.