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My fear was that I couldn’t create an account, great models, fast service!
3D Models World have a reliable Youtube videos / tutorials and great 3d models.
Before purchasing, I was worried about the quality of the models and the UV’s but I had a good experience fast and easy to purchase.
The biggest fear was that the model is not very detailed and far from the real crane. But when I open the model using an AutoCAD I found that the model was very very detailed even I can directly use it for an FEM simulation in other commercial software. 3D Models World could help you a lot in your projects.