YAEFD for dc motor and MK4 hotend
thingiverse
This is a modified version of the Extruder Filament Drive, designed to work with existing MK4 extruder components. The idler arm may be adapted to utilize a 608 bearing if possible. Suitable for use with the Makerbot MK4's motor and hot-end, though adjustments might be necessary. Follow these steps: print, test, modify as needed, and provide feedback. Alternatively, consider using "Printruder II Dino" by wulfdesign from Thingiverse (http://www.thingiverse.com/thing:5394).
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