Here is the UM3D Lab's new MakerBot; a $1,300 kit you put together yourself. It took about 60 hours to assemble requiring some cutting, soldering and a lot of patience. Initially, the kit came with the MK-5 extruder which used a DC motor to drive the filament. This setup lasted about 2 hours before the controller gave up. The MK-6 upgrade kit resolved the issue a new controller and stepper motor and includes the experimental 1.75 mm filament feed. IMHO, this is a huge improvement as the tension adjuster is eliminated.
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