double Hobbed bolt bowden extruder :)
thingiverse
Introducing the upgraded bowden extruder, released on May 12th, 2014! This new gear set offers oblique operation, ensuring quieter performance. Previously, on March 25th, 2014, a version for 3mm filament was added to the parts list. The required components include two hobbed bolts, two 608 bearings, four 688 bearings, two M8 threads measuring approximately 30mm each, two M8 nuts, a PTFE tube of around 100mm in length (4/2 for 1.75 filament, not required for 3mm), and finally, two M3 bolts of roughly 30mm in length accompanied by nuts.
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