This video starts out with a much easier way to cap a heightfield/landscale mesh. Then I show how you can make flat bottoms for heads (and other things) using various different approaches, including Boolean union/difference/intersection. I also explain the new Inspector tool for assisting in mesh repair/watertightness, and briefly show how to quickly do a bit of hollowing to reduce material usage for 3D printing.
http://www.youtube.com/v/UUufQ9zFh-Y