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Basically any company involved in the manufacture or distribution of 3D systems are worth a look. Look first at companies that are major players in traditional printers today. I hesitate to recommend specific companies as I am not a broker and don't want to take responsibility for anybody else's investments.

I would use "3D printers" as a search term and start researching from there.

I compare this to around 1980 when personal computers were just starting to move beyond hobbyists and geeks. Most people still scoffed at the idea that average people would want to have a personal computer at home. They still saw computers as room sized machines operated by men in white coats. But for those who saw the applications and the potential of a home computer, they were amply rewarded.