What era are you planning to focus on? Determining that could help with recommendations. War Times Journal had an extensive range of scalable 3D printed models in the WWI and predreadnought periods, but they have ceased production. They now offer digital print files and the opportunity to print them yourself. I've not tried it (yet).
Navwar offers a range of 1/3000-scale models. I do not own any, but I know many who do and they seem like nice representations. Here's their site:
Fujimi had a line of 1/3000-scale plastic models that was decent, but it was primarily models of WWII IJN ships. I don't know if these are still available or not, but worth a look if you can find them.
There are probably other manufacturers as well. Others may be able to recommend a few.