Anet A8 modular axial fan mount adapter

#Attention (2019-04-22):

I have created a new and (I think) better fan duct for the Anet A8 with axial fan:
https://www.thingiverse.com/thing:3581278
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When my blower broke after 3 months, I did not want to constantly have to buy a new one. So I looked for a possibility that can last longer and use other fans.
Then found this, which corresponded to my first rough idea: https://www.thingiverse.com/thing:2149198.
However, in my opinion, a 80mm fan is too big to mount on the extruder. and