I got fed up and made my own, a triple 50mmm shroud called The Monolith. It's pretty okay but does not cool that extremely well. But it's vbery quiet. https://www.thingiverse.com/thing:2486908

Great working cooler/ducts/carriages:
-https://www.thingiverse.com/thing:1632847 E3Dv6 Bowden X-carriage mount v2 for Prusa i3 by Tech2C, published Jun 18, 2016

works very well, but you'll loose print space on your Y axis of about 2 centimeters.

-https://www.thingiverse.com/thing:2143520 ANET A8 | Customizable E3D v6 Carriage / Bowden Mount by TNS, published Feb 12, 2017

Works better than the one stated above. Saved Y bed space. And has more auto leveling support of a circular and tronxy sensor.

I have removed these designs because I printed them and they failed on me.

Either due to:
-Scrapping my prints
-Tedious installation with screws and bolts [no nuttraps, hard to reach] (i'm pretty handy and I can have enough tools and different screws)
-Breaking on installation
-Or not cooling sufficiently leading to bad prints [this is due to crappy design (I have used various fans and converters 30, 35, 40 and 50mm fans with or without fan adapters)]

-https://www.thingiverse.com/thing:1337200 E3D V5 & V6 SINGLE & DUAL fan duct holder (Prusa I3) VER 2.0 by trustfm, published Feb 12, 2016

[same as below, melted, broke on installation, annoying Nut and Bolt usage.]

-https://www.thingiverse.com/thing:1663353 E3d V6 Valcano center piece for dual duct fans by davidwyl, published Jul 8, 2016

[for a normal e3d It sucked and scarpped my prints, it also melted since the cable could not be routed anywhere else and leaned on the duct.]

-https://www.thingiverse.com/thing:2315489 E3D Layer Fan by Print3DFab, published May 12, 2017

[barely any cooling on the print unless the fanduct was right above the print]

-https://www.thingiverse.com/thing:1292038 All-in-one fan duct for E3D v6 by DWONH, published Jan 25, 2016
-https://www.thingiverse.com/thing:1667012 e3d All In One fan mount 40mm by Joe558, published Jul 10, 2016

looks very nice but does not fits Prusa i3 clones.