Here is something to be aware of with the EZ Fill Capsules: The air pressure inside the cart can built up somehow, causing the ink to push up into the real vent area and saturate the cotton filter at the top. I am not sure if this is from temperature changes here or what, but I had this happen last week and ink leaked onto a nice 13x19 print... I just stuck a push pin into the vent hole of the offending insert to make sure it was cleared out and cleaned the outside of the cart and capsule. That seemed to solve it and there haven't been any issues with subsequent prints.
Richard Boutwell