Wanted to build a dual J Head setup for my Wilson TS variant of the Prusa i3 Rework. Like this design as it allowed for more or less easy calibration of the heads and included wire routing as well as extruder fan mounts. Got as far as updating the design from http://www.thingiverse.com/thing:712783 for use with the i3 Rework X carriage, then my E3D Chimera arrived in the mail. I've printed this and it prints nice and the mount lines up but I have verified all works as expected. Throwing it up so others can use it if they would like. I may use it in the future as it's a nice setup. :)