Fixed Fishbone Gears (47/9 double helix). Wade-Greg-Jonas Kuehling extruder

thingiverse

The initial gears by Stoffel15 caused slight interference due to differing helix angles between large and small gears. In the previous design, the large gear's helix rotated 200º/47 and grew 5.5mm upward, while the small gear's helix rotated 200º/9 and grew 6.25mm. To resolve this, both gears now have matched helices; the large gear retains its original definition, and the small gear's helix rotation is adjusted to (200º/9) * (6.25/5.5). The updated files include modified SCAD and two Autodesk Inventor part files with an xls parameters configuration file. In the revised design, Inventor introduces a small clearance in the tooth's hollow (tooth 19/40, recess 21/40), while maintaining a backlash of 0 in SCAD, as per the original design. A related video can be found at http://www.youtube.com/watch?v=envbj-yDYhI.