Pear effector - v2

This effector were inspired by Kirill91's one (http://www.thingiverse.com/thing:1569106), designed for E3D-V6.
I wanted one for E3D-V5 (and E3D-V5 clones), and this is an improved version of http://www.thingiverse.com/thing:2208759.

Pay attention: I used small axial fan (http://tinyurl.com/l3kpx46), 25mm X 25mm X 10mm.
I also used some magnets (4mm diameter per 3mm height, from www.supermagnete.it) to join diffuser ("diffusore") with base. This greatly simplify assembly and disassembly without any nuts.
A good idea would be to add some kapton all around aluminium hot block in order to insulate it.
The project is full working on my Kossel mini since 2 months: even though it is simple to dismantle, compared with V1 version, there should some issues concerning total hotend lenght, depending on your nozzle lenght, you have to verify that distance between lower heatsink surface and nozzle tip is at least 25mm, since distance between lower heatsink surface and lower diffuser surface i