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RE: 3D Printing a Yoda Star Wars Bust
Okay, thanks for the insight, still have to visualize things to grasp it. But I think this design does not fit the description. Will have a go at it, using your guidelines.
Based on the original at RoboHash: 
STL file: CLICK HERE
Here the eyes on top of the head will be problematic to print without support material if you try to print it this way. Depending on the 3D model there are times that you might be able to overcome the issue by just rotating it around and not have it 3D printed the way it should normally be used.
With the 3D model on the photo if the stand at the bottom was not extending to the back you could just rotate it on its back and print just fine without support materials. You can still do it now, but support material will be required for proper printing.
Yes, you got the idea of having it 3D printed rotated on a flat back for example and thus going without the need to use support materials. When you are 3D printing on your home 3D printer you usually do not go for solid insides of the object as it is taking up more material and time to print and is rarely beneficial. Instead you use about 10-20% of infill and the 3D printing software uses a hexagonal or round pattern to fill the inside, so you get enough strength without having it 100% solid.
That will be the next step to do, hollow it, add hex structure.
But that will be at a later stage. Time flies when you're having fun. ;-)
If I get a bit a grip of this, then this would at least work a bit better...
Designed it to be flat:
And here is the STL file to download: CLICK HERE
Did not optimize anything yet. Think some material could be saved by making it hollow inside.