Mount a HiTEC HS-55 micro servo into a lego project.
The brick itself is equal to 3 (2x5) Lego bricks. So it can be "bricked" into a nice support structure to hold it in place.
Print parts So Mount hole faces up. Its designed to reduce edge curling.
In MakerWare, I modify the "Medium" settings:
Quality: Layer Height = 0.18
All other defaults are the same.
If you don't have a 3D printer we can make you one pretty cheap.. badbrick.com/catalog