Finally is designed a very useful AddOn for the DaVinci 1.0 Pro AiO - PLA Fanduct (https://www.thingiverse.com/thing:2017981). Works with an E3D v6 hotend.
Take care of the hotend temperature, i added about 10°C. I switch the fan on after about the first 1-3 layers and the results were pretty good so far.
I printed it with supports (not inside the duct) and the fan-slots at the bottom.
Edit - 2017-09-23
There is a small problem with the build plate, but only at the beginning of a print. During the print its fins. So be careful. I am going to change this in the next 2 days!!
Edit - 2017-09-24 - Version 1.3
Testing while printing -> OK!
Testing to set/calibrate z-axis -> OK! (Only a little touching ;))
Testing to switch to engraving module -> In Progress!