Tutorial: How to make internal model "without modeling"??

What do I mean by "without modeling"?
If you have a model in which internal geometry is very complex and you want it, now its easy way to do with solidworks...enjoy

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For example, this can be used for:
-in sand casting, when u have a model like this pump, and we need to have the inner core...
To get a more accurate model of the internal geometry, main model must be more accurate, I mean on the draft angle during the creation of a model ...
Ok, this is it, enjoy...

Answered with a tutorial: https://grabcad.com/tutorials/tutorial-how-to-make-internal-model-without-modeling

 
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Why this option doesnt apear to me? I only see the internal volume, but the

 
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