Bowden extruder v2

thingiverse

Bowden Extruder with Adjustable Filament Pressure This model allows rigid and semi-flexible filament extrusion. Designed parts can be printed without material support. Modelled using free software DesignSpark Mechanical (.rsdoc file) Non-Printable Components: Two M3 x 12 screws for fixing the base (orange part in illustration) One M3 x 18 screw serving as a hinge for the tension arm One 684ZZ ball bearing One spring: string diameter 1.0mm, inside diameter 7mm, outside diameter 9mm, height 22mm One Allen head M3 x 16 screw and nut for adjusting the spring tension One M5 pneumatic connector One MK8 Drive Gear Assembly: The assembly is identical to that of the first version of the extruder. The illustrations below are those of v1, but it's strictly the same for this new version. Mount the ball bearing on the arm cover axle and assemble everything on the arm. Place the M3 nut in the small movable piece and screw in the headless screw. On the base, mount the pneumatic connector, present the two M3 x 12 screws, and position the spring tensioner in its housing. Place the MK8 drive gear on the NEMA17 motor shaft. Mount the plate on the motor. Screw the base without tightening it, allowing the arm to remain mobile. Adjust the MK8 drive gear so that its center hole is perfectly aligned with the guide hole of the filament on the base. Place the spring in its housing. Place the tensioner above its spring, put the arm in place, and screw it in without tightening, leaving the arm mobile. Tighten the nut using an Allen wrench to adjust the tension.