I worked with Next Fab Studio in Philadelphia to develop 'Sunshade' a 3D Printed Prism Cover for my Google Glass.
I open sourced the code and it's available for anyone here to print and test out: http://prserve.com/sunshade/Sunshade1.0.zip
This $2.42 3D-printed ‘sunshade’ makes Google Glass easier to use
venturebeat.com