This is a E3D V6 Clone fan duct which can simply be clipped over the cooling fins. The fit is so tight it supports its own weight plus the weight of the stock Anet A8 40 mm cooling fan. I use it in my setup in combination with the carriage here: https://www.thingiverse.com/thing:2099577. This design allows more air flow and therefore more cooling than the crappy mini fan which came with my clone. I had to design it, because there was no satisfying solution available on thingiverse. The designs I found were either not fitting or restricting the air flow to much. The Duct was designed in Autodesk Inventor Professional 2016. I included the .ipt file, so you can modify it if you like.
- Radiator diameter = 22 mm
- Space between hotend mounting cap and heater block = 31 mm (In reality I have additional 3-4 mm space to the hotend)
So if you have the same meassurements you can print this duct and use it. I hope I could help at least someone and contribute to the community somehow. Thank you!