Good luck with the stl. I probably made the sphere too large. Not syre it's actually printable when resuzed to 25mm.
Ah you're using cura.

haven't looked at the latest release, but don't like the layout.
Got a beta copy of vshaper to try. Impressed with the demo i got at the tct.
Although not entirely sure it'll run on my 32bit windows 7
horrible feeling i might have to stick 64 bit windows on for it to run.

Interesting to see how you get on with the he3d fan duct, looks like it will catch the belts to me. But haven't bithered to actually print it. I do have some turbo fans.