I had to install a new black print head on our HP1050c today. It was only a couple of months old and not very used (we only use plots for in-house tasks). I didn't think too much about it; black is the most used ink and this is old technology that had probably been sitting on a shelf for years. I didn't have one, so I ordered one from our supplier. Almost as soon as the new one was installed there was black ink leaking everywhere! I've got black in places I can't even see inside the plotter. I called the supplier; they're sending out a tech to see if the ink leak is from the print head and what's to be done about it.