I haven't pursued it in a while, but I have done a bit of stereo slide photography. My grandfather was a stereo photography buff and left me all his stuff when he passed. I have a camera with two lenses and a projector that has two polarized outputs. But like anything else, it is very time consuming. For good slides I need to use 50 ASA film which usually means setting things up on a tripod. Cutting/sorting/mounting are also very time consuming. I usually use cardboard mounts until I determine whether the slide is good enough. Then the slides get transferred to aluminum/glass mounts. My grandfather made the slide feed and change mechanism using relays.
It's not like taking a pic with your phone. You have to carry a lot of stuff with you. Like a light meter and extra lenses, lens cleaners, tripod, etc.. The camera is very heavy and only has a manual shutter. But, I have some very nice stereo slides of Stone Henge from back when they use to let you walk among the stones (mid 80's).