The Canon FINE print system uses a high-performance 1,856-nozzle print head that ejects consistent, prescribed-volume droplets as small as 2 picoliters. What part don't you undertand? lol.
Actually, they're not expensive to run either. Best thing is that they use separate cartridges for each colour so you don't have the annoying problem of having to throw a part used cartridge out just because one colour is exhausted.