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It's a dual hexagon extruder. I respect the decision to concentrate on one system rather than trying to be all things to all people.

I would be a bit careful on the brand new stuff from E3d for...

Clough42 - how goes it with the dual extruder?

Quick edit :). Yes, I was referring to the center to center on the extruder.

the fans can be rotated out some due to the clip on shrouds, so I think it could be less than the full 30mm.

Just guessing but there could be room for e3d v6's as well. Was there a dimension on the center to center of the nozzles?

Ordering 2 more nema 14's in preparation for this.

If the tension springs don't work, you could adapt the idler blocks with through holes for a pair of socket cap screws with compression springs...

clough42 - I printed your belt drive extruder and got a nema 14 motor from pololu. It will probably be a week or two of resolving a few other issues I'm working on, but I will install it and see how...

The tee nuts only work one way. raised part must be away from the screw head.

Clough42 - I noticed you had designed and used fan shrouds and fans for the x axis motor and extruder motor. I just got my i3V printer and have only printed 3mm pla via J Head, however none of the...