This is a sunglasses case I designed for my Pit Viper Sunglasses. They are no designed for The Double-Wides or The Exciters, only The Originals.
The two halves are designe to be printed seperately and then held together by running a piece of filament (1.75mm) through the pin holes and melting the outer edges to lock it in place. If you would rather use a nut/bolt. The diameter can easily be modified using FreeCAD. A note on modifying the FreeCAd files: if you try to modify the top, you will need to download and link your own font. I used Vermin Verile, which can be found here - https://www.dafont.com/vermin-verile.font
The cost of this is ~$1.87 for the bottom piece and ~$1.35 for the top. All together that is $3.22. A commercial equivalent cost ranges from $8-$20. This provides a cost saving of at around $5 in addition to fitting The Original style Pit Viper very well and the custom text on the top.