I've created a very simple soldering fume extractor using a circular fume filter for kitchens, which is the most common type here: https://www.amazon.de/-/en/GENUINE-BOMANN-256300-2-Piece-Extractor/dp/B01BMJQP92

And a 12 V 12 cm computer fan: https://robolinkmarket.com/12v-dc-fan-120x120x25mm

It is assembled using 2x50mm M3 screws and 2 x 20mm M3 screws.

The fan director fits on top of the assembly.

Only needs a power source, 12V adapter may be used, or maybe serially connected batteries…