Our HP T120 has heen a workhorse in our Office for over 5 years. When the print head ommunication messages begin to occur its time to invest in a fresh printhead. This will save you time and money as bthebnew printhead arrives with a fresh set of ink cartriges.
I’ve had my printer for 6 years and it works very well. However the printer head needs to be replaced every 2 years or so. When the head is replaced, it prints like new. My machine does not get a lot of use. I send out files to be printed for larger jobs. I have been using HP plotters for over 30 years and have not had to replace heads like this in the past. I think they should last longer.