I have a epson 7800 , here,( in santiago, chile), there is a company that sells some clear plastic cartridges that you refill with some ink the sell you,
they say that since the cartridges dont have any foam inside you can fill them with up to 250 ml, the ink has no brand on the bottle other than their company logo, TIMG, they claim is just like epson ultrachrome..... the only thing I found was that the ink and cartridges are made in korea..... once you buy the empty cartridges, (about $ 60 each), the ink is dirt cheap, ( $ 25 for one pint).
here, original epson 220ml ink sells for $ 110..
this company TIMG is big down here on the small cartridge refilling bussines, but I have a $ 3.000 printer!
advice?