This is an extruder gears set for the TechZone Huxley extruder, featuring herringbone teeth.It is intended to replace the 2 lasercut wooden gears. I printed one set but haven't mounted it yet - I'm waiting for the original gears to break or wear first.This use 2 modules from the MCAD library that you can get from https://github.com/elmom/MCAD - Thanks to the authors. Some bits - the motor gear mount hub with set screw hole - are derived from http://www.thingiverse.com/thing:3104 (thanks GilesBathgate) which is under GPL CC license.Print, mount, recalibrate your E_STEPS_PER_MM (ratio changed), use and let me know how it works.I suggest printing those separately - hence the 2 STLs - if your printer oozes / strings.