Besides the "Introduction to the Mastercam X Interface" series (videos 1 thru 3), We now have a new video available for viewing on YouTube. It talks about Solid Modeling using the Extrude function.
[nomedia="http://www.youtube.com/watch?v=cdn01jc_5OY"]YouTube- ‪TFM - Mastercam Solid Modeling - Extrude‬‎[/nomedia]
Enjoy,
Mike Mattera