@WildZBill - can you quantify what you're seeing doubling every six months (e.g. speed / quality) and give us some examples? At the DIY level, we're still dealing with pretty much the same technology - albeit with an explosion of interest and designs - that we were three years ago when I bought my first printer. Print head technology hasn't moved on a great deal and the fundamentals of the designs are still largely the same. I have zero experience at the high end level and would be very interested to hear what's happening.