The SaveModelToPackageAsync function is essential for saving and packaging 3D models into 3MF files when dealing with them in C#. However, when the mesh linked to the model is faulty, issues such as COMException frequently arise. Successful saving may be hampered by problems like non-manifold geometry or inverted normals. Before attempting to save the model, it is crucial to validate the mesh and make sure it is error-free by using suitable methods such as VerifyAsync.