Quadstruder K7 v2 - Dual Drive Extruder

thingiverse

Updated version of the quadstruder using stainless steel gears instead of brass, with the brass gears in the previous version showing a fair amount of wear after several months of use. The stainless gears should last longer, but I haven't tested them for very long. Designed to work with 1.75mm filament, it uses two filament drive gears and two gears to keep the gears in sync. The secondary gear is tilted to adjust the pressure on the filament. Shorter 2mm M3 set screws may be needed on some of the drive gears if the ones they come with are too long. Parts: * 1 x Nema 17 Motor (I prefer high torque 400 step motors - [Amazon](https://amzn.to/2jD9fXa) or [Filastruder](https://www.filastruder.com/collections/electronics/products/high-torque-axis-motor) or [Robotdigg](https://www.robotdigg.com/product/1250/0.9-step-angle-NEMA17-stepper-motors)) * 2 x stainless steel gear ([Aliexpress](http://s.click.aliexpress.com/e/rVvvfUJ)) * 2 x Knurled drive gears ([Banggood](https://www.banggood.com/DIY-Ultimaker-2-UM2-Feeder-Knurled-Wheel-Extruder-Drive-Gear-Stainless-Steel-For-3D-Printer-Accessories-p-1021796.html?p=EY011634303112016018)) * 2 x MR105 Bearings ([Amazon](http://amzn.to/2EjfFHE)) * 1 x 5 x 30mm Dowel Pin * 1 x Bowden Coupler ([Robotdigg](https://www.robotdigg.com/product/348/Heavy-duty-push-fit-bowden-connector-4-01)) * 1 x M3 Heat Set Brass Insert ([Trimcraft Aviation RC](https://www.trimcraftaviationrc.com/index.php?route=product/product&path=75&product_id=528)) * M3 screws (four M3x35mm, one M3x10mm socket cap screws, 2mm set screws) Make sure there aren't any collisions as the gears turn. The set screws should be out of the way. The gears on the motor shaft should be slightly lower than the ones on the 30mm shaft so the drive gear doesn't rub against the bearing. More info about how this differs from several other dual drive bowden extruders can be found on [Thrinter.com](http://thrinter.com/2wd-dual-drive-extruder-designs/). Printed in Esun Translucent Blue PETG and Atomic Filament Transparent Green PETG.