This topic relates to 3D printers that are kitted out. U-build it. Obviously, these will not keep up with a 20K dollar unit in speed or finish, however, at an accuracy of 0.0004 in, and sub thousand dollar, these sound like a reasonable unit. As far as I can tell, provided that the extruders are acceptable, the design is in the frame and action. Most are using printed frame connectors and steel rod framing. I figure the unit could be refinished with aluminum rod connectors (instead of printed plastic), and move to servos to increase accuracy. The cost of the servos would and machining time and material cost would drive the unit up towards 2500 USD. What is your opinion. How accurate are the kit units, which kind performed well, etc.