Designed in tinkercad using a black oakley display stand for dimensions. The riser system on this one is a little easier to print and fit than some others and allows options for adjustable height for bigger or smaller glasses.

The "two way glasses stand" takes a riser on the bottom and top for stacking more tiers. The "Top glasses stand" takes a riser in the bottom only and is used for the top tier on the stand.

The short riser (42mm) fits my fuel cells perfectly. The tall riser (54mm) hasn't been tested by me yet, but should allow larger sunglasses to be stacked up. I can upload some other heights if needed.

This model can be glued for extra stability, but is not necessary. Just remember, the taller it goes the less stable it becomes. It seems to take 4 tier stacking very well.