6 model

Free

Sherpa Mini Mellow RIDGA

Printables

Free

Printrbot Helical Extruder Gears

Thingiverse

Free

Printrbot Helical Extruder Gears (Large & Small)

Thingiverse

Free

Beefier helical extruder gears for printrbot

Thingiverse

Free

Ornithopter mechanism with duble-helical gears

Printables

Free

Right Angle Helical Gears

Thingiverse