Blender Tutorials DVD 12 18 making an object hollow

Blender DVD training 12: Blender for 3d printing by
Blender Foundation
licensed as Creative Commons Attribution 3.0

This Training DVD is for everyone who is into 3D printing, beginners and professionals alike. There are extensive chapters introducing Blender modeling for new users. It then handles all topics you need to know for efficient and good quality 3D prints, including color, wall thickness or overhang problems.