PLEASE READ THE INSTRUCTIONS BEFORE CUSTOMIZING, FANS HAVE DIFFERENT DIMENSIONS AND ARE NOT STANDARD TO GET A CORRECT DESIGN Y YOU HAVE TO MAKE SURE THAT YOU ENTER THE RIGHT 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. // v 1.0.3 : added cone angle for the larger fan // v 1.0.2 : fixed bug in sizing the fan plates // v 1.0.1 : fixed output fan cone to tube size, increased size of fan opening // v 1.0 : first releaseTO GET A CORRECT DESIGN Y YOU HAVE TO MAKE SURE THAT YOU ENTER THE RIGHT VALUES FOR 'Ls fan1' and 'Ls fan2' FOR EVERY FAN SIZE, THEY ARE DIFFERENT AND ARE NOT STANDARD The code is written in openscad, if you use the 'Customizer' link on the right here are the variables you can change. The design only supports square framed fans with screws spaced evenly (in a square shape as well) ALL DISTANCES ARE IN mm ALL ANGLES ARE IN DEGREES A- Essential variables T Wall : this is the thickness of all walls and fan mounts D Fan1 : this is the diameter of the first fan Ls Fan1 : this is the distance between mounting screws of the first fan Ds Fan1 : this is the screw opening diameter of the first fan D Fan2 : this is the diameter of the second fan Ls Fan2 : this is the distance between mounting screws of the second fan Ds Fan2 : this is the screw opening diameter of the second fan L Mani1 : this is the distance between the smaller fan plate and the twisting manifold elbow A Cone : cone angle for the second (the larger) fan A Mani : this angle of the manifold tube twist, range from 0 to 180 degrees B - Advanced variables Az Mani : (NOT IMPLEMENTED YET) allows manifold tube rotation around Z-axis, I may have a chance to do that next week C- Not commonly modified variables N Pipe : this is a scale factor = diameter of the pipe/diameter of the fan, it's the same for both fans $Fn : this is a resolution setting for all arcs and cylinders, means that a complete circle will have 50 segments, increase the number if you wish to get higher resolution curves at the expense of rendering time