Just got a 3D printer and stumbled across this project on Thingiverse.
https://www.thingiverse.com/thing:3723433
This guy designed his own 2" EP's from old binocular parts.
Seems like a cool project for someone who's curious. I'm not game - I know that I do not know enough to get that working, but it might be fun for a tinkerer.
Markus