Response: Inkjet ink is one of the most expensive liquids by weight. Some inkjet printers can be configured to have nearly unlimited ink using a continuous ink supply system (CISS). Search keywords, "epson ciss". Epson has models that use 4 colors of dye sublimation ink: cyan, magenta, yellow, and black. Search keywords: "epson ink refill". Ink refills cost around $30 for a full set. Those are cheaper than using 6 colors printers.
These Epson printers can be flushed with special cleaning fluid. Search keywords "Printhead Cleaning Kit Printer Flush Kit".
The printer I use is an Epson Workforce 2760. If you search on Ebay or Amazon, you will find similar printers.
Epson has their own version CISS called eco tank. They are more expensive than a CISS kit.
One downside of some CISS is that if there is a power outage, the system must be reset using a button to simulate changing the cartridges.