My (no name) glasses broke, so I redesigned/improved them to my face and to be printable without support at 0.1mm layer height.
To buy the screws you can follow the affiliated link below, or search for them on in your favorite shop:
8mm M2 Grub Screws on AliExpress
After printing (with PLA) you can soften the earpieces and bend them inwards to adjust the fit. Also, before inserting the glasses soften the nose bridge and bend the glasses towards your face. If you are already wearing glasses, you will know what I mean. Adjust it to match your current frame's curvature. I decided to print the glasses flat and postprocess with hot water later to simplify the print.