Ninjon, I think.and black magic crafts. Squidmar, maybe? Honestly, My YouTube is mostly Warhammer and DND terrain hobbyist, so I don’t notice their names too much, just surf the algorithm. You could try " 3d print wargaming terrain" as a YouTube search term. Most of the people working with that will talk about 3d printed models aswel

Cults3d and myminifactory have a lot stuff. But you might need some creative search terms to get what you want. A lot of stuff is also on Patreon, I mostly find them through sponsored YouTube content.