According to an October 2014 Gartner report, "Worldwide shipments of 3D printers will reach 217,350 units in 2015, up from 108,151 in 2014. 3D printer shipments will more than double every year between 2015 and 2018, by which time worldwide shipments are forecast to reach more than 2.3 million."
Gartner also predicted that "end-user spending on material extrusion technology will increase from $789 million in 2015 to around $6.9 billion in 2018. Overall, end-user spending on 3D printers is expected to increase from $1.6 billion in 2015 to around $13.4 billion in 2018 with technologies such as vat photopolymerization and material jetting leading this growth due to expanded acceptability within the consumer and enterprise markets."