Here is a very simple fume extractor fan, to put an halt to apnea soldering.

Made of:

• DC/DC buck boost converter (3€ on ebay)
• USB battery pack 5€
• scrapped fan
• scrapped switch
• scrapped potentiometer
• Hammond prototype case (1€, same as my USB motion sensor)
• nice labels
• double side tape

Enough talk, a picture:

And in action, can suck up to 15cm at medium speed:

This “hack” took me 30min, and costs close to nothing, while some have been down to build a DC/DC converter for this!

Thing to add in the future:

• active carbon filter for better filtering, but usable as is for small jobs: you don’t get fumes in your face anymore.
• USB light for soldering in the dark

My favourite use: in the freezer/fridge, when you forgot to chill beers for an unexpeted party, it takes only 10min to have freezing beer instead of 1h. (remove the carbon filter first…)