Is there any way to refill OEM Epson large format cartridges?

[costadinos]

Just curious, is this easy, or even possible at all, to do?

The chips on the x890/x900 can be reset with most, easy to find, chip resetters.
The cartridge is a pressurized "bladder" type.
Does anybody know of any practical way to bypass the one-way valve and inject ink back, directly into the bladder, from the ink outlet hole?

 

[The Hat]

If you need to know anything about refilling any Epson cart then @jtoolman is the expert around here, if it can be refilled then he has done it.

Here is part two of five of his great videos on the 3880 cart which are similar to yours,
PM Jtoolman for any further information you may need..
http://www.youtube.com/watch?v=9zJepnArTdo