The Afterburner (for AnkerMake M5 Direct Noctua A4 Extruder Fan Mount)

The Afterburner is an additional part that adds static blades after the moving fan blades to increase static pressure output of a Noctua A4 (40mm) fan. 

It's designed to interface with the duct from the AnkerMake M5 Direct Noctua A4 Extruder Fan Mount as a way to get just a bit more performance out of the fan. Don't expect any miracles with this, but it can give you that slight boost you need when the ambient temp is hot.

I printed mine in PETG, but it doesn't really get hot at all so use whatever you'd like. I used supports just to get cleaner blades, but I don't think they're required. I'd be interested to see what this would be like printed in TPU. 

I remixed a model I found on here for speed of design, but was initially inspired by the Voron StealthBurner's extruder fan mount. Their’s is a bit more polished but this one is effective from my limited “feel the output with my finger” tests.

Print testing has gone great and I haven't noticed any stress or abnormal noise from the Noctua fan. It will be a touch louder after install, but you won't notice it at all from 6 feet (2 meters) away.

This is just a “good enough” starting point, but feel free to remix this design (I do not have a CAD model) and post it!