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Wonder when one will be able to print a working 3D printer on a 3D printer?
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It is already happening... In a way.
I have seen quite a few guys print new better parts to upgrade their scratchbuilt printers.
But a fully functioning printer, hot off the printer probably isn't too far away, one hurdle is probably being able to print many different materials in one run.
For example, copper for the stator coils in the stepper/servo motors.