Printrbot Helical Extruder Gears
thingiverse
To enhance power transmission, I replaced the original printrbot extruder's lasercut spur gears with helical gears. Herringbone gears have one floating side, but these helical gears are a suitable alternative. The prints exhibited improved quality immediately after the gear switch. For installation on a Printrbot LC, simply bolt them on and use a 5/16" bolt for the large gear and an M3 nut and screw for the small gear; this modification might fit other models too, although compatibility is uncertain. I intentionally undersized the hole for the large gear to ensure a perfect fit after drilling.
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