Quadstruder K7 - Dual Drive Extruder

by walter, published

Quadstruder K7 - Dual Drive Extruder by walter Feb 12, 2018
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps


Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

2497Views 81Downloads Found in 3D Printer Extruders


Cheap 1.75mm dual drive extruder using standard parts. It uses 4 drive gears, two of them function as gears, keeping the other two drive gears in sync. The secondary gear is tilted to adjust the pressure on the filament. Make sure the set screws don't interfere during assembly, shorter set screws may be needed on some of the drive gears.


More info about how this differs from several other dual drive bowden extruders I've just uploaded on thrinter.com

Printed in Esun Translucent Blue PETG*

*affiliate link

More from 3D Printer Extruders

view more

All Apps

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

Treatstock is an online platform that offers decentralized manufacturing services such as 3D printing and CNC machining for clients all over the world. We offer free and instant access to comparati...

App Info Launch App

3D print your favourite design with NinjaPrototype, a professional 3D manufacture with consistent quality and speed.

App Info Launch App

Great work! Is it possible to make it fit 2.85/3mm filament as well? Thanks!

Hi Walter, awesome design, as ussual. Please, could you measure outside diameter of bronze gears? Thanks!

Thanks! The 26 tooth gear is 11mm in diameter. The height of the gear (along the axis) is 11mm.

seems like it will work only with 3mm filament. am i wrong?

It's actually designed to work with 1.75mm filament, the secondary shaft is tilted slightly to close the gap between the two drive gears. The adjustment screw changes the tilt. It won't work with 3mm filament without modifying the filament path.

I was having a hard time coming up with names, that would have been a good one except for the trademark issues :)

Unlike the Bondtechs, this one is direct drive so it doesn't have the benefits of a geared extruder. It is cheap though.

In your opinion, hich dual drive extruder works best?

It really depends on too many factors to know, if I wanted a lightweight extruder, I'd probably buy a Bondtech BMG or a Titan Aero (I haven't used either or seen them in person). I really like the Bondtech gears with a geared motor I'm using on my Eustathios, but wanted to try something different (and cheaper / quieter).

Since weight isn't an issue for my current use case, I'll probably use this one (Quadstruder K7) or a similar variation since the form factor works better for me, but that's specific to my printer. If the form factor worked out better, I'd probably use the Fostruder H4, mostly because I like the simplicity of dual motors, but the two motors make it a bit awkward in constrained spaces. If you need to do anything that really stresses an extruder (0.15-0.25mm nozzle, metal filaments with a 0.3mm nozzle, bad filaments, etc), I'd go with something that can use a large NEMA17 motor or uses a geared dual drive extruder (like the Bondtechs). The amount of torque available probably makes more of a difference, any of the dual drive systems should have more than enough grip.

I've been wondering if there are differences in how much slippage there is as a function of backpressure with the different styles drive gears (hobbed, knurled, gearhead), but I would have to do some testing to figure that out.

There are also differences in resolution, but I'm not sure how much difference it really makes, especially in a bowden system using decent stepper drivers.