UPGRADE is here: https://www.thingiverse.com/thing:3191077
This is a mount for the E3D v6 hotend using the direct drive which comes with the CTC Prusa i3 Pro B.
It includes a fan duct for a 50mm fan (I used an old CPU fan) and a sensor holder for an inductive distance sensor (in my case: LJ18A3-8-Z/ BX). The x-rail mount is not included, but I guess there are heaps available here, if you need one.
All parts can be printed without support (even the fan duct if left side is facing downwards).
Requires some 20/25/30mm M3 screws, washers and nuts to put everything together.
The sensor mount might require some filing on the edges, since it sits pretty snug on other two main hotend mount parts.
(This is an extension/rework of https://www.thingiverse.com/thing:2157393)