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Don't even attempt to print, unless you got something similar to this: http://www.thingiverse.com/thing:1823404
I wasted a lot of plastic until I realized I needed much better cooling than the stock fan duct can provide.

On my 10th attempt, I used a circular fan duct similar to the one reference above, and the following cura settings:
Layer height .2
Initial layer height .32
Infill density 20
Printing Temperature 185
Build Plate temperature 60
Retraction distance 4
Retraction speed 60
Print Speed 30
Travel Speed 120
Initial layer print speed 10
Regular fan speed 90
Maximum Fan speed 100
Regular Fan speed at Height .32
Build Plate adhesion type Brim

Key points : lower the nozzle temperature, use brim support, lower the printing speed and boost the fan close to max.
Good luck!

Anet A8 prusa-i3 circular fan duct
by Sjouke