JD Duallie Belt Driven Dual Extruder for Ord Hadron, others

This is a belt-reduced non-bowden dual extruder, with care taken to allow flexible filament use. It has a tight 17mm nozzle interval, can probably be made under 500g. This was designed first around the Ord Hadron X carriage, but other mounts should be forthcoming.

I tried my best to minimize the weight penalty over many non-bowden single extruders. I believe I can have a working unit under 500g. The first working prototype is 600g, including hot ends and motors. Many direct drive single extruders are in this weight range, making the weight penalty of a second direct drive extruder negligible.[br]

Care has been taken to allow for flexible filament use, a straight path with minimum seams & joints, and no room to buckle. However, flexible material hasn't been tested yet.

The filament idler pressure is easily adjustable, and there is a "bird nose" quick release to allow visible access to the hobbed pulley or to quickly switch materials.

I designed around an Ord Hadron carriage, but with a simple mount plate, it will mount to a MendelMax 2 carriage soon as well.

This is a work in progress, but I have had about 40 hours of successful operation. The photos represent my first prototype, the drawings represent improvements based on use.

Videos of the design running:

https://www.flickr.com/photos/34962649@N00/14809349302/in/photostream/

https://www.flickr.com/photos/34962649@N00/14576061370/in/photostream/

On an Ord Hadron, it requires no modification to the carriage, and only a little adjustment to the X limit endstop. It still allows 196mm of full dual extrusion X working width. Mount plates for other machines should be coming soon.

The instructions and BOM are in Open Office files in the download section.

A STEP Assembly file was added March 18, 2015.