Mini Kossel Hot End Dual Fan (40mm + 40mm)

This is my second 3D OpenScad design, so please be kind. This is a modified version of the hot end fan by Johann Rocholl. The Mini Kossel master zip file can be found at https://github.com/jcrocholl/kossel
It has been specifically sized for a J-Head hot end.
It is also based on my 30mm version, but I found that the 30mm fan I bought was very noisy. Could have been because it was cheap.
I enlarged to a 40mm fan with a duct to blow cool air across the printing part. I have uploaded to Op