Moving Extrudate Cooler (for Prusa i3 with Diamond Hotend)

So here is my first Thing...

This moving extrudate cooler is designed in FreeCAD to fit on the X-axis bars of a Prusa i3. The X carriage drags it along the bars, allowing it to move 20mm left and right.
This makes that the mouth of the funnel (30mm) is mostly behind the extruder for optimal cooling of the part of your print that was just extruded.
And it's mounted on the back, so it never blocks your view.

The Fan duct was derived from thehans' design and reworked in FreeCAD, completely