Consumer level 3D printing fits the description. The type of plastic fused deposition modeling machines (Makerbot, etc) that are common now all largely hail bac

Consumer level 3D printing fits the description. The type of plastic fused deposition modeling machines (Makerbot, etc) that are common now all largely hail back to 2-3 open source designs, which they then tweaked and improved on. Hobbyists are still pushing a lot of the game forward with better software and interfaces, as well as ideas for improvements like heated build beds, etc. Knowledge is often shared on web forums and blogs.