I had a spare 140 mm PC case fan and wanted to build myself a fume extractor from it. I'm not much of a designer, so the square shapes I tend to work with lent themselves to this retro style.

You need:

1 * 140 mm PC case fan (I used a PWM fan)
1 * 12V DC power supply (or whatever fits your fan)
1 * PWM fan controller - [https://www.amazon.de/dp/B07F6YJC2S](https://www.amazon.de/dp/B07F6YJC2S)
1 * activated coal filter - [https://www.amazon.de/dp/B07WR72S4Y](https://www.amazon.de/dp/B07WR72S4Y)
4 * M4x8 screws (DIN912)
4 * M4x30 screws (DIN912)
2 * M10x16 bolts

The lid is printed with a layer change at the text (PrusaSlicer should pick it up automatically when you slice it).

I recommend re-orienting the stand on the build plate so the thin parts are facing down, and adding a brim to prevent lifting.

The electronics can probably be dropped in favor of a simple flip switch if you go for a 140 mm DC fan instead.