Core One high flow rear duct

100mm diameter mates to easily obtainable and cheap ducting from your preferred big-box-store. 

Rotate to point the duct up if needed. Mirror in your slicer if you need to point in another direction. 
 

I wanted an exercise in making something that would flow air well. I’ve not done analysis to find if it does. Maybe for another project.  

It’s not perfect, and uses more support material than I’d like. But was fun trying out different CAD tools than I’m used to.