Digital BW, The Print

I do suspect it has something to do with the ink cart itself. Seems 
once I get it going it runs ok. I noticed that the ink cart mis 
supplies is completely different from epsons carts on the inside. 
Far less complex. Also mis has the funky little vent apparently 
missing on the epson cart. I doubt epson would have put all the 
complexity into their carts if not serving an important purpose.
 I have numerous empty ink carts. Did you just buy CF ink and start 
filling the carts yourself?  How do you know when the cart is full 
so that when the chip is reset the chip will not let the cart run 
dry?
I am definitely interested in knowing how the fill process is done.

Thanks, 
Charlie