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by sergeykish 2080 days ago
Because RepRap [1]. Proprietary 3D printers already were on the market.

Because you can print 3D printer with 3D printer. You can make paper templates with paper template.

[1] How he started the worldwide 3D printing revolution / Adrian Bowyer https://www.youtube.com/watch?v=VV0Tjwq7Uc0