Summary

I needed to lighten my default extruder head (I have Reprap Mendel Prusa from FolgerTech), therefore I splitted it in two: a bowden extruder (http://www.thingiverse.com/thing:1436572) on a side and a JHead on the other.

Of course I looked on existing JHead / E3D holders and I didn't found a full satisfying model.
As usual I decided to make my own.

I tried to install my previous version (http://www.thingiverse.com/thing:939956) but the sensor bracket has broken and I didn't persisted.
Lately I identified that some of my print quality troubles came from an extrusion cooler missing so I had one.
In order to have an extrusion cooler close enough to the hotend, I removed LED ring and choose to move lights around bed, attached to the printer body.

I designed it with OpenSCAD in case of change of screw, JHead, ... modification.
I did it quickly and dirty (I'm no very proud of the code and it's not bugless), but I choose to publish it as customizable anyway.

Enjoy! :)