My first attempt at making a mini solder fume extractor fan was a bust, but I really liked the compact size which fit in my Stanley organizers, and the USB charging. The problem was the 60x20mm fan sucked and not in a good way. I also did not like how jam packed the electronics bay was which was largely a factor of needing two boards, one for USB charging and battery management and a second boost converter to jump the 3.7v of the battery to 12v for the fan. Recently however I found a board that should integrate the USB battery charging with a boost converter. It looks like they pretty much took both boards and put them side by side, but that's fine. I bought a couple of them to try out, along with a 12V 0.2A 60x25mm fan and a larger 1000mAh lipo cell. If it all works out then I may be able to get a decently powerful mini fan working in a few weeks. The pic above is the heavily re-worked design to fit the new components (it's not final though since I don't have the boards yet).
My mission is to lower the collective IQ of teh Internets one post at a time.