A couple of mumbles.
Ed I agree completely. Once the industry starts to set up shared files that we all can contribute to, CAD (now Revit) models will be incredible. I've been designing buildings now for 40 years. Big one like 70 story towers and airports (soup kitchens too). My small company doesn't much participate in Revit, but the architects and contractors do to convert my design to a physical building.
Watch the prices of 3D. I've seen a pilot model sell for $ 800.00 and the next week be on line for $ 20.00 or so.
It's a really fascinating industry now, no longer a smoke stack one.
The Luddite in me suggests that printing your own models from your own files is a while off. But wow, sending a file from source A to printer B is now possible.