>>999Games workshop are cunts and will sue you into oblivion if you try and copy their stuff but people still make very similar things on them. If you want to print models the tech isn't quite there yet, resin printing is very close but it's still got issues. It's also very toxic and messy to deal with so it's a health hazard if you want higher quality models.
Normal 3D printing which is melting plastic instead of using a laser to cure resin still shows slices where each layer is put down. Even when printing ultra fine layers it's still visible if you look for it. On models it's going to be a problem unless you're just looking for cheap junk to put in your D&D game. No one cares if your skeletons are covered in lines, there's 40 of the things.. Where normal 3D printing excels currently is buildings and tokens. You can use car filler primer to fill in the lines and do a bit of sanding to get really good quality buildings. Since most terrain is ruins there isn't a huge amount of small detail so it "just works" as they say. But it takes 15-20 hours to print a building so it's not something you mass produce on a whim.