You can 3d print just about anything in titanium if you have deep pockets, it’s just that it’s not often that good an idea. Those brake calipers didn’t really benefit from being titanium, forged or even just machined aluminium is an absolutely superb material for calipers. It’s really useful for tiny product runs mind, which suits companies that are selling stuff purely on boutiqueyness and exotictude.
(it’s kind of like CNCing stuff from billet- it’s actually a pretty poor way of making a lot ofthings, but it looks nice and there are cool machines involved, so it weirdly became a selling point. While forging stuff still gets dismissed as “stamping stuff out” even though it’s often better. So when Hope finally upgraded their production to using forgings for a lot of parts, they still said it was cnc’d from billet and designed the new brakes to have fully machined outer surfaces because they’d spent so long convincing their custoemrs that was the best way to do it, and had to design their forgings to be less good than they could have been so they had extra space for machining. Marketing-led manufacturing is weird)