3D printing market over the next four years

At the rate the 3D printing is expected to grow over the next few years, its market value could be worth as much as $16.2 billion by 2018.
Canalys senior analyst Tim Shepherd explained that while this is a fast-evolving market, it's "still in its infancy."Latest research from Canalys says the overall market, including the 3D printing machines and the total cost of supplies and services, has already reached a $2.5 billion in 2013, and is expected to rise to $3.8 billion this year. 
According to the firm, the value of the 3D printer itself grew by 109 percent in 2013 to $711 million, and is expected to slow but retain strong growth to 79 percent this year to hit $1.3 billion.

Global 3D printing market
Estimates and forecast of market value to 2018 
Category2013 (est.)2014 (est.)2018 (est.)Growth ('13-'18)
Total$2.5B$3.8B$16.2B45.7 percent
3D printers$0.7B$1.3B$5.4B50.1 percent
Services, materials$1.8B$2.5B$10.8B43.8 percent
(Image: Canalysis estimates, forecasts)