I'm in process of buying this printer, great features - including using ink HP 950 and 951 cartridges which are ink containers feeding a fixed print head (salesman info). I have been refilling my own cartridges for quite a while. All of the refill suppliers sites I visited say that they do not have instructions for refilling these cartridges yet. The printer is pretty new but is that "code" for "they are not refillable"?