I made this fume extractor to get the solder smoke out of my face. It uses a simple 70mm fan, powered by a 9v battery, and has activated carbon filters inside.
It's designed to have the two halves glued together. The ears can be attached with 3mm bolts, but you could easily just glue them on without any trouble.
You can find links to the tools and materials used to create this here: https://goo.gl/steX6D
Be sure to check out the YouTube video over on my channel for the full build.
There are a few areas on the face that have enough overhang to require support material, but it's minimal.