Simple Dual-Extrusion upgrade

This is a an attempt to build a simple dualstrusion mechanism, using a single motor and single hot end.

The idea was to provide with a simple upgrade possibility to many people who have a single extrusion setup. And keeping the cost low and fun high while at it!!

Right now i am designing for a direct-drive setup. But this can be easily modified for a Bowden type extrusion setup.

Also for the cooler, I am using an aluminium block with a heat-sink. (custom design)
but if you wanted to use a E3D v6, simple modifications could be done.

Assumed limitations:
1. filament is wasted trying to avoid contamination.
2. print time is increased because it uses a single hot end.

The setup being designed consists of:
1. Nema 17 stepper, being used for Direct drive extruder.
2. MK8 SS drive. (9mm x 11mm - effective dia 6.8mm)
3. 1 of 624zz bearing each for the two idlers.
4. Some spring or rubber band for tension on the idler arms.
5. Standard size RC servo (~40 gms)


Tips: