If you found my things useful, you can buy me a cup of coffee: http://paypal.me/marcuss24
The original fan-duct is best what I found, but it doesn't fit on E3DV6 hotend. So I edited it for E3DV6 hotend.
Download Fusion 360 files / 3D Assembly: Here
Use with these 50mm radial fans: http://s.click.aliexpress.com/e/b4UNaIiy
! Don't use PLA !