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The disadvantage of the Hex Dominant meshing technique is that it generates poor elements in transition regions between hex and tet elements. A pure hex mesh can be generated by splitting up the model and using the Multizone meshing technique as per the video below. The video considers only one parts. You need to divide the parts as per the image below to get a pure hex mesh. 

<iframe width="560" height="315" src="https://www.youtube.com/embed/AJFHvoKNy2c?rel=0" frameborder="0" allowfullscreen></iframe>

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