I wonder if it's necessary for each dilution to have its own syringe and needle. I've been using just one for all six carts and thoroughly rinsing out the syringe between each filling. I wait till I can get a clear stream of fresh water, then for good measure do a few more rinses.
I'm not that cheap! It just simplifies the matter.
BTW, just ordered and received a set of the newly designed InkJet Mall carts for my 1430. I'll report back on how I make out. Anyone else tried those?
Cheers,
Paul W.