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In early 1990s, I was pursuing Master’s in Manufacturing Engineering. As a teaching assistant I used to work with AGVs(Automated Guided Vehicles) and Stereolithography machine. We used to create parts using resin bed and a UV laser solidifying photopolymer.
That was fascinating invention by Charles Hull who invented the machine in 1984. His idea with the machine was to build prototypes using CAD(Computer Aided Design) software. Major automakers including General Motors instantly saw the benefit of Stereolithography machine for the prototypes since the cost was less than sending blueprints to tool-and-die shops.
The cost of the machine was staggering $100,000 in 1988.