E3D hot end smallest mount / J-head mount for the Ultimaker

This is an early fork of my generic head mount (http://www.thingiverse.com/thing:159390) that is specifically suited to the J-head mount of the E3D (3mm filament).

The vertical size is slightly smaller than that of the stock head, slightly bigger on the left X: so DO CHECK your end stops before you run this head else homing will make some noise you do not want to hear ;)

Still no attached fan for the deposited material. I enclosed the heater block with loose kapton to isolate it, and I use a 120mm powerful fan to blow on the platform instead. It makes the whole head lighter, and more importantly, it reduces the wobble at the nozzle.