HP Designjet printer complete list by model number, with suggestions on a reliable ink company for after-market ink, especially for HP Designjet 5000 and 5500, but also others.
42" HP DesignJet 500 Large Format inkjet Color Printer wide format Plo – Precision Toner
HP DesignJet 500PS 42" Inkjet Color Printer/Plotter (Working) w /printhead+Ink - YouTube
HP DesignJet 500 24-in Roll Printer Software and Driver Downloads | HP® Customer Support