When I got my 3D printer, the first spool of filament I bought was transparent / crystal. No regrets.

Most of those are pretty cool, but the watch really let the gimmick compromise the function. Clock faces need to have high contrast for minimizing the time it takes to read the time.

I’m told that prison tech is transparent.

This looks so cool but a part of me is terrified of them slowly and unevenly turning yellow, just like an old phone case of mine 🥲