Previous means of producing a prototype, typically took man-hours, many tools, and skilled labor. With this technology, casting or molding plastic would be unnecessary and will be replaced.
This process is commonly referred to as rapid prototyping and the first version of this technology was introduced in 1986 and was called Stereolithography. With the new three-dimensional printer being the latest technology introduced in this field of rapid prototyping, the older methods and techniques are being replaced by the digital, faster, cheaper and more efficient ways of 3-D printing.
http://www.me.psu.edu/lamancusa/rapidpro/primer/chapter2.htm#techniques
http://en.wikipedia.org/wiki/3D_printing
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