The wavelength of the light both influences what materials they penetrate and at what angle they get scattered. Can’t speak for this particular material, but UV has a smaller wavelength than visible light, which gives it a smaller scattering angle. So it gets scattered more all over the place and makes it around little corners more easily. And you’ll never be able to tell whether or not it was dangerous because you can’t sense UV in any way.

Idk anything about 3D-printing, just came in from the main page to give a heads up. But maybe these could be fitted with UV filtering foil or even lenses? They make thin ones you can cut to shape (I have clip ons like that).

Sorry to be that guy, but be careful with these. Everything will seem darker, so you won’t shy away from the sun as much, but you still get UV in your eyes, which can damage them. They look really cool though!

I’ve heard them called mail carriers. It’s more precise, for example my mum is a postal worker, but doesn’t carry mail (she has an office job with postal services).

Force me to participate in a system where I gave myself burnout working enough to be allowed to be alive on a post scarcity continent