The E3D-v6 fan shroud and mount was modified from the Think3DPrint3D piece ( https://github.com/T3P3/kossel/blob/master/Release3/STLs/R3-Hotend_fan_ir_e3dv6-v2.2.stl ) to work with the KozzleNozzle parts cooling fan. The Kozzle Nozzle itself was modified from the version for the Prusa i3 MK2 to with with the 40mm blower style fan.
Both pieces use the same attachment method to the effector, so they could be used with the default T3P3 Kossel Mini effector or the effector I created that works with Haydn Huntley's magballs and rods.
These were all designed to take the minimum amount of space possible outside of the effector diameter to minimize impact on usable print diameter.
The blower fan is a 4010 12V fan, and it, along with the nozzle, have proven very effective at cooling PLA.
You will need supports from the bed only for the KosselNozzle. I used Simplify3D where that was an option. Not sure about other slicers. If you use full supports you will get support material inside the fan nozzle, which is not good.
Since this will be near hot-end it needs to be printed in heat resistant material. I used Raptor PLA from MakerGeeks that was annealed for heat resistance. ABS would work. PC also works well.
The E3D-V6 Hot End Mount should be rotated so the large fan opening is facing the print surface.
With permission, I took the Cova Nozzle design files into Fusion 360 and modified them to work with the 40mm blower-style fan.