I agree that there is something fascinating about the 3D printing.
This seems to stem from two ideas: Printing as a quick and easy additive process and the possibility that a machine could "print" the pieces parts for its own assembly therefore creating the idea of machine replicatation.
We all see tremendous potential for 3D printers. I believe that the killer app will be one that enables a widget to be scanned and replicated by the 3D printer. When that becomes available, broken parts will be possible to replace again. [Did you ever try to find a replacement slider for a shower door? Scores of designs, none can be found.] I'm so tired of a penny part causing an expensive item to be unusable. For years I've also believed that a fair licensing process to enable production of replacement parts would benefit manufacturers (less inventory, royalties coming in from consumers) and consumers who would be able to restore items to working condition.
I sooo want a 3D Printer. When I was in Norway last year giving the keynote at the FPGA Forum, I also gave a guest lecture at Oslo University and they showed me some of the stuff they were building with their 3D printers (I still shiver at the thought of thr robot spiders scuttling across the floor).
Recently I saw a do-it-yourself quad copter kit that involved you creating a lot of the parts yourself using a 3D printer.
I think that my main problem would be finding the time to (a) learn how to use it and (b) actually use it :-)
Actually, several have been announced recently in the range of $300 - $500. I have been curious about comparative quality myself. The article I read (I couldn't find it, sorry) talked about how they were coalescing around standards which were driving down the price. If these guys want to sell me one for four times that amount I would have to see something that convinces me that it is worth it. Is it higher resolution or faster? Will it last longer? Is the build material cheaper?
One difference is that the cheaper ones tend to come out of China. This is somewhat ironic given that country's role as manufacturer for the world, but from what I have heard they are already adding 3D printing to their other manufacturing expertise.