This is an air cooling nozzle for 40 millimeter fan for printing area cooling. It's currently prepared for printing, "netfabbing" is not required,
It snaps on the bracket that holds the printhead. It suits well for both single and dual head version because they have the same bracket.
It just snap on it and do not need any additional support.
The one on photograph is of a previous version, I have made some changes to it and did not test this one, but due to changes were minor (increased overlap of the exit nozzle, added a hitch for power cable and few more), I'm sure it goes.
Just print and install on the printer. There are holes for fastening the enthusiast. I reccomend you paralleling it's power to the right printhead fan, there's a small tooth to measure the cable.