To begin, thanks to jmillerfo for this excellent hepa filter!

I have remixed it a little bit because I'm not a fan of glueing parts together, I love it rock solid :)

This is exactly the same design except some hole and support to screw the fan mount into the chamber. Of course you will need supportS :P but once printed, you can insert brass knurl inserts into chamber part and secure the fan part with M3 screw.

I also include a 60mm 2mm tick gasket to print in tpu to make sure it's seal.

I have not printed it yet, so print at your own risk (the holes is super duper aligned)

Creality

Ender 4

Doesn't Matter

Yes

0.32

100%

Print chamber X+90deg to avoid excessive support.