This is a prototype and untested replacement fan duct for the RepRap Fisher for use with ABS. This stops the part being blown whilst letting the air from the cooling of the hot end escape sideways to avoid the part.
Should be easy to swap as the Fisher extruder uses just one bolt to hold this in place.
Untested use at your own risk.
The fan duct could be improved by making it a lower profile as the duct work could be mostly removed, for now I have sealed the duct ends.
Mk2 version updates the internal structure of the duct.