He better be explaining this one seeing as it’s a simile

When I went to glass it took me an embarrassingly long time to realize I needed to up my bed temp by 10° if I wanted good adhesion

I swapped to glass a few years ago and the things I have learned since are that glass that’s too thick will cause you issues with bed temperature, and you can print PETG on it so long as you can guarantee you’ll be there when the print finishes to release it with IPA or you’ll have chunks of glass missing from your build plate. I got a G10 build plate 2 days ago and sofar I’m liking it more than glass

I would refer to that as thickness, but I’m not a jeweller. My advice stays the same though, try some on and see what you like.

My wedding band is ~8 mm and i’ve never worn a ring less than 4 at its narrowest point. I would say just find something you like the look of, and see if you can find something at a jeweller that’s similar you can try on if you’re that worried about the fit.