A simple bracket I designed to mount two 30mm blowers (Delta BFB0312MA Brushless Blower 3010 12VDC 0.08A 3-pin) to my Titan Aero. They serve as my part cooling fans without restricting my view or access to the nozzle.
Designed in Fusion 360. It took me about 25-30 revisions to get the angle and position right. It's still not perfect but it works on the rare occasion I need a layer fan.
These fans only have two mounting holes. They're diagonal from each other so if you tighten one screw too tight, it will flex the housing and make the fan scream. I probably spent an hour getting the screws just right.
This isn't a perfect design and it turns out these fans aren't ideal for part cooling. Their operating voltage is something like 10-13VDC which means, at least with my DuetWifi, that they'll only run above 94%. So if you want a set up like this, you might look for different fans with a wider range of operating voltage. These fans are pretty powerful and I was planning on running them at around 30%.
100% infill because the part is thin. Depending on how man shells your normally print with, there would probably only be a layer or two of infill anyway.