Parametric Annular Fan duct for centrifugal blowers

thingiverse

I'm upgrading my kossel fan part. I had an old fan but didn't want to buy a new one that fit the previous model's dimensions, so I created a parametric version myself - sorry about the coding! I tweaked some things to improve printability, extended the tab for pivoting too. Changed the mounting point for the fan to be adjustable rather than relying on a mysterious number based on abstract math. Also changed the screw size calculation so you can specify the diameter instead of radius like before. A few more changes and since I'm struggling to figure out how to do it properly, I've uploaded two scad files for common blower sizes - some relationships have been simplified. Added STLs and low-poly versions