JGR direct drive 1.75mm extruder (updated 14/3/2013)
thingiverse
The direct drive extruder, designed for 1.75mm filament, employs an artline pen spring and a machined filament drive. To assemble, follow these steps: print the object, mount the stepper motor, clear out the spring slot, insert the artline spring, attach it to the RepRap carriage, install the hotend, and print your desired item. You can obtain the filament drive from 3D Industries Australia or Trinity Labs. Additionally, it includes two extra holes for the upcoming vertical X axis (V6) and is compatible with MK7 drive gears. For more information, visit http://thejollygrimreaper.blogspot.com.
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