Gearstruder J4 - Dual Drive Extruder
thingiverse
Minimal extruder housing for use with the [Printrbot Gearhead drive gears](https://printrbot.com/shop/gear-head-extruder-gear-set/), 1.75mm filament, and a NEMA14 motor. The secondary gear is inserted from the side, and the additional M3 screws or setscrews hold the gear in place and adjust the tension. It's designed to use a bowden coupler from [RobotDigg](https://www.robotdigg.com/product/348/Heavy-duty-push-fit-bowden-connector-4-01). Make sure the setscrew doesn't stick out on the primary drive gear, especially if using a motor without a D-shaft. Filament is [Emerald Green PETG from Atomic Filament](https://atomicfilament.com/collections/petg-3d-printer-filament-us-made-with-free-shipping/products/ruby-red-translucent-petg-pro). There is also a [NEMA17 version](https://www.thingiverse.com/thing:2772470) and info about several other dual drive bowden extruders I've just uploaded on [thrinter.com](http://thrinter.com/2wd-dual-drive-extruder-designs/)
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