To me, 3D Printing and Revit are a match made in heaven. Unfortunately, it is not as easy as simply pressing "print". Dave posted a little video on how to get started with 3D Printing and Revit.
"This is the first of two videos that will cover 3d printing. In particular, this tutorial will cover exporting a video from Revit, scaling the object in Max, and basic modifications to prepare for printing in ReplicatorG."