I made a quick little friction-fit glasses rack since the designs out there I wasn't a huge fan of.
You'll need one pair of tray and shaft per pair of glasses, but the top pair should use the cap instead of the shaft.
I used 0.2mm layer height, 10% infill.
Supports will be required on the shaft if you print them in the uploaded orientation (the way I've been). You could rotate them 90 degrees so the plug end of the shaft is up as well, but I have not tested that.
The author hasn't provided the model origin yet.