I love this printer, although you have to override the feature that automatically stops printing when the toner is low. I've found that I get many pages of good quality copies even after the printer said that the toner was out, but you have to manually reset. It appears that there are a couple of warnings. One warning lets you know that you're getting low on toner, at which point you better buy another cartridge. The printer keeps printing, so no problem.
Then later, in my case many weeks later, another warning kicks in and completely stops you from printing. You could just replace the cartridge, or what I do is override this and just keep printing until I decide that I don't like the look anymore. You'll lose a little paper at some point because you'll have to reprint, but paper is cheap and toner is expensive so it seems like a good trade-off to me.
Here's how it works on my machine. Yours might be a little different, so experiment to make it work, but just remember that there should be a way to override and keep printing even though the toner's low:
1. Open the door as if you're going to replace the toner (but don't replace).
2. You might have to press the "menu" button.
3. Press the "clear" button.
4. Scroll with the down arrow until you see the color that has "run-out"
5. Press "OK" to reset (#1 on my machine)
6. Finally close the door again. The printer should now reset itself and keep printing. You might have to press "start" or cycle the power on and off again.
7. Remember that you're almost out of toner, so make sure that you have a replacement cartridge available.