3D Printing Lego Bunkbeds, Modeled in SketchUp
This video shows how to model a Lego-compatible toy bed that can stack into bunkbeds. You'll see how to work with part tolerances, and how to get and use the extension that converts from SketchUp to STL. http://www.3dvinci.net/ccp0-prodshow/SSS_3DP_Basics_PDF.html