I agree with Marcus. I think the software needs to be easy enough that a grandmom can jump right into it. This along with printers of decent quality and ease being under the $400 price range and filaments being cheap as well. I think by 2015-2016 many people will be surprised as just how fast things have taken off in the 3D Printing world. Gartner just released a report predicting growth of close to 2000% within the next 3-4 years which is simply staggering to imagine. If the market grows by 20 times by 2016, where will it be by 2020?