Customizable Nesting Eyeglass Case

This is the evolution of my [Simple Eyeglass Case](http://www.thingiverse.com/thing:1133957). I know that eyeglasses come in all shapes and sizes so I built this for your customizing pleasure.

I've had the best results with 0% infill for flexibility. You may need to play with the `buffer` variable depending on your printer and filament. TIP: stop the print 1/3 way through to test the nesting friction.

UPDATE 2016-09-05
Added a lip on the inside half for easier gripping.