Modeling for 3D Printing - Making it Manifold

Maybe not as fun a topic to do a video on, but an important one for future videos. "Manifold" is often shorthand for "3D Printable". That's not exactly true, but it's a good place to start and can spur the discussion of how to make printable models.

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http://joes3dworkbench.blogspot.com/
http://learn3dprintingblueprints.com/