There are just a couple of fan ducts for Anycubic I3 Mega here and both are not perfect for me.
So here is another one I made.
Fits fan very tight.
V1 - Use 2 x M2.5 nust to fasten well. /// don't print it - shit design (((
V2 - more centered ring, more smooth design.
The next update is fastclip fan duct (screwless) + lowprofile edition (2 mm up from nozzle tip) - you don't need to disassemble the hotend cover to change the duct )
Update 10.10.2017 (best for E3D v5 hotend edition) - use this please
V3 - low profile duct - more space between the ring and the nozzle tip (current layer)
V4 - fastclip - no need to disassemble the hotend cover to mount this
Update 16.10.2017 (E3D V6 MOD EDITION):
V5 - extra-low profile for you can use it with E3D V6 hotend.
V6 - extra-low profile fastclip version for you can use it with E3D V6 hotend.
So guys, I've made all of versions and V3 and V4 are perfect for me: made V3 with V4 installed ))) V4 fastclip works well!
Catch my new housing for MEGA hotend + turbofan mod here: https://www.thingiverse.com/thing:2706092
Use one support from the table under the lower hole.
Don't use another supports.