I wanted to create a simple fume extractor to combine with my Pinecil. Consequently the fume extractor should be driven by the same power bank so a USB fan would be necessary. 

Also I did not want to make a soldering project of the fume extrator, so I wanted to use existing components. So I desigend a housing for a 120 mm USB fan and 2 activated carbon filters (10 mm thickness) which you can simple buy (e.g. on Amazon https://www.amazon.de/dp/B07WR72S4Y? and https://www.amazon.de/dp/B08RDJJ99B?).

If you want to use filters with a different size, just send me a message and I can add a variation.