Summary

If you like my work I hope you'll consider supporting me on Pateron: https://www.patreon.com/3DPrintingProfessor

Subscribe to me on YouTube: https://www.youtube.com/user/mrjoesays

Made a glasses holder for my son so he's stop losing his glasses.

Measure the box size necessary for you glasses, in Blender resize the hole to that size, turn off modifiers and resize the box to be 4mm bigger in all dimensions, then position the clip arm and export. Then print, line with cloth (I used the cloth that came with his glasses for cleaning) and voila.