If you want a more durable version, you can make a pretty decent headset on a laser cutter out of mdf.
http://www.thingiverse.com/make:78503
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Andrew Walbran's profile photoPeter Strømberg's profile photoDavid Coz's profile photo
3 comments
 
I started by making that one. All those screws make it heavy (though funky). After 20 people tried it I realised everyone, from kids to grandparents adjusted the lenses to the same place, so I fixed it there. Admittedly people who normally wear strong glasses need more adjustable ones. 
 
+Peter Strømberg that was mostly our finding too. Most people we tried with are happy with the lens setup, and having no movable parts makes the design so much simpler. 
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