Full source at https://github.com/sherifeid/3dobjects.git
PLEASE READ THE INSTRUCTIONS BEFORE CUSTOMIZING, FANS HAVE DIFFERENT DIMENSIONS AND ARE NOT STANDARD
TO GET A CORRECT DESIGN YOU HAVE TO MAKE SURE THAT YOU ENTER THE CORRECT VALUES FOR 'Ls fan1' and 'Ls fan2' FOR EVERY FAN SIZE, THEY ARE DIFFERENT AND ARE NOT STANDARD
If you find difficulty using the customizer just post a comment or send a message with both fan dimensions, the manifold angle and length and I will generate it  
This is my first attempt to design from scratch a programmable fan adapter that converts from ANY size to ANY other size with a few parameters. It also includes the ability to bend the airway (in a manifold tube shape) at any angle from 0 to 180 degrees. I posted the first size I need which is a 30mm to 80mm fan adapter with a 45 degree twist for my rostock max tri-head peek cooling. Comments are welcome, also attached the openscad source, please check the instructions tab for more details about how to customize it for you need.…