A simple case for cheap reading glasses. It's quite finicky to get the measurements right so there is a parameterized FreeCAD file included where the dimensions can be adjusted. One can also try scaling the model file for the same result. With correct dimensions, the glasses should stay inside holding the case upside down. Thick frames work best. The flat “stand” at the end, functions as a handle so that the case is easier to pull from your pocket.

As the glasses are slid into the case, you might want to avoid doing that with expensive ones to avoid any scratching.

Printing the case doesn't require any support but does need a good bed adhesion. Orient the case standing flat on its bottom when printing.

The sample is printed from PLA with XL and 0.4 nozzle.