The earliest 3D printing manufacturing ____ was developed by Hideo Kodama of the Nagoya Municipal Industrial Research Institute, when he invented two additive methods for fabricating 3D models. Chuck Hull of 3D Systems ____ the first 3D printer in 1987, which used the stereolithography ____. This was followed by ____ such as selective laser sintering and selective laser melting, among others. Other expensive 3D printing systems were developed in the 1990s-2000s, although the cost of these dropped dramatically when the patents expired in 2009, opening up the ____ for more users. There are three broad ____ of 3D printing technology; sintering, melting, and stereolithography.

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