If you use more than 7 cartridges a month, for 1800 you can buy 6 and with the reload station you get 7, If you do 12 or more cartridges then savings become apparent, but I don't think anyone is doing that much with this machine, I mean if you are dropping 4000 $ in white ink a month in 1 year you could get a new machine.416 for the rental I think is ....... not the nicest to say the least, if you hit a bump in production and use less than 2000 cc in any given month you'll be loosing to using cartridges.