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Do some geometry cleanup & consider only half portion for mesh because of symmetry.Try with solid mesh & convert geometry in to mappable volume.(one volume or multisolid)
I see you have too many feature lines in your model.First try to have simplified geometry(free from geometrical error).Also please refer below geometry editing tutorial.
Do some geometry cleanup & consider only half portion for mesh because of symmetry.Try with solid mesh & convert geometry in to mappable volume.(one volume or multisolid)