double Hobbed bolt bowden extruder :)
thingiverse
yes ! 2x hobbed bolt => bowden extruder update 2014-05-12 add new gear set :) oblique, quieter operation update 2014-03-25 add ver. for 3mm filament parts: 2x hobbed bolt 2x 608 4x 688 M8 thread 2x ~30mm M8 nuts ~ 100mm ptfe tube 4/2 (for 1.75 filament, for 3mm filament no need) 2x m3 x ~30 and nut
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