I’m trying to find out what purpose this type of design serves and how they are designed but have hit a wall with knowing what to even look for.
This piece of the voron stealthburner is the only example I can think of off the top of my head but I have seen them before in some sort of fan duct or funnel thing.
They discuss it in some detail in one of the Voron Live talks - I think this one, which was the announcement video for Stealthburner. Lots of CFD combined with manufacturability testing and aesthetics mixed in too.
Edited to add: oh, that’s the hot end fan. I don’t remember if they discussed that or just the part cooling fan, but the video is an interesting watch either way.
Oh yeah. They put a lot of thought into it. I’d say it’s probably one of the more over engineered bits… but they’re all kinds over engineered… heh.