We are still a very long way from 3D printers going mainstream. According to a report by Gartner, only 56,507 3D printers costing less than $100,000 was sold in 2013.
Howerver, Gartner projects that the market for 3D printers will grow 97% annually over the next five years, which would mean 826,000 will be sold per year by the end of 2017.
There is still too much 3d printing hype around the technology for consumers. But companies are using 3D printers to make highly customizable parts.