This video explains how to use the new support structure generator in meshmixer 2.0. This tool is used to generate a branching tree structure to support overhangs in 3D printing. The results are still a work-in-progress, but usually require significantly less material than other support structure techniques, and as the models get larger, also significantly improve print times.
Want to try it out? Grab meshmixer 2.0 at 123dapp.com/meshmixer