If this technology were readily available, there would be no need to scratch-build parts. Yeah, you might get a warm and fuzzy, "I built that there dinglewhopper" feeling for building it yourself, but I look at it this way. It already takes me far to long to build a model. If I can shave a couple of hours by 3d printing my parts instead of scratching them, guess what I'm going to do?
And I think Pat has a point. Not everyone would have a NEED for a 3d printer in there home. So I don't see that Xerox will be rushing to get this to market.
As for contest, we can already get nearly any part resin cast by somebody, really what is the difference? Only the skills of the guy/gal building the model. As it should be.