By the way, I thought this is a well known thing. Is it? I don't remember how WeInk recommendation was for priming Epson cartridges. It was on their web site before. It was far more complicated. I did not try it back then. I did experience a lot of clogging issues from my R300. I never go back to R300 trying to make it work again. I don't need a dye based printer with an Epson badge on it.