Everything that's broken suddenly needs a nail.
I ran out of black ink for my document printer. I got through a few extra pages with a 'mixing' option, but when the black ran out, I was stuck. This printer was not going to be nice and let me squeak out a few more pages in purple or brown instead of black. It refused to print anything.
Sigh. I got a set of the four inks that the printer requires. But I only needed to replace the black. I'm going to do a little shopping around and see if I can find just the black. I use it up faster than I use the colors and the containers of ink are the same size.
I know that you get better quality printing when there are more colors of ink for the printer to use. I do not care about quality from this printer, I don't want to be forced to buy extra colors of ink when all I need is black.