Anet A8 fan duct hybrid

V2.0 (2017-11-04)
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Simply added a schematic for easier imaginize the difference between the height of 20mm and 22mm.
Last weeks I printed only with this duct, and I am very satisfied.
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V2.0 (2017-10-07)
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I have completely redesigned the fan duct and now it works as I imagine.

Improvements to old version:
(old version is in zip-file)
- easier to print
- bigger tube
- better air flow at all holes
- corner bevelled to optimize the airflow and reduce resistance
- improved blow