Summary

This is a plate of the Quick-Fit X carriage ( http://www.thingiverse.com/thing:19590 ) for use 2 extruder J-Head Mk V-B and bowden cable.

Instructions

The fan mount is not designed for J-Head Mk V-B but I think It should work with two J-Head Mk IV.
The distance between the two extruders is 22mm.

For mount the plate, youÂ´ll need:
-x2 M3 30mm bolt
-x4 M3 20mm bolt
-x6 M3 nut
-x12 M3 washer