More details I found looking at his page:

He works as a cnc designer professionally for biomedical and aerospace industries and he designed and manufactured this himself.

None of the eyes he’s made (he’s made MANY!) are 3D printed, they’re machined, medical grade titanium so they don’t get hot from the LED and are safe to use as a prosthetic.

He wants to make them for other people at some point, but says he has a lot of research and development to do before that can happen.