I would have assumed some post-processing would be necessary to create a polished surface, but what really blows me away is that it's possible to make the entir

I would have assumed some post-processing would be necessary to create a polished surface, but what really blows me away is that it's possible to make the entire interior void-free and consistently dense to create a transparent lens with no air bubbles or interior pockets. I can't even do that molding resin by hand.