Meshmixer version 2.6 is now available and that means that you can access the tubes functionality, aka PipeDream, that we discussed a while back, for your 3D printing needs.
This is a fun application of the tubes technology from the 123D blog where they created a custom water sprinkler.
Here's a short video of the workflow via Autodesk Screencast.
Designing for Advanced Manufacturing
$100 Million 3D Printing Investment Fund Plus Meshmixer API and Scripting