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[clough42]

For a dual-extruder setup on an i3v, I keep thinking the easiest route would be to print out a second set of X-carriage parts, and get 3 slightly longer bolts to go through the wheels to attach a second carriage to the back of the original carriage. This would sandwich the extrusion between the carriages, which would share the wheels. You'd lose 0 X distance, but maybe too much Y distance. Though any lost Y distance could be compensated for by using longer Y axis extrusions and belt.

Actually, another extruder behind the rails would strike the frame on both sides.

I'm still thinking. Y separation is interesting to me as well, but it would have to be in front, which adds more torque to the load on the wheels.

I'm also thinking about ways to get the nozzles closer together. Like the heat blocks 2mm apart. Tricky, but I think possible by staggering the hobbed bolts in the right way.