Sources

Works Cited
http://www.wtec.org/loyola/rp/03_01.htm, Joseph Beaman http://www.explainingthefuture.com/3dprinting.html, Christopher Barnatt http://3dprintingfromscratch.com/common/types-of-3d-printers-or-3d-printing-technologies-overview/ http://www.avplastics.co.uk/3d-printing-history