If you've replaced all the cartridges & cleaned everything (that means the electrical connections in the carrier too where the cartridges sit, right?), you may still have a bad black cartridge (I've seen it happen) and you might try another one, otherwise you may have a defective printer that can no longer use the black cartridge correctly anymore. It might be cheaper at this point to get another printer.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.