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Depends on your tolerance. :) http://en.wikipedia.org/wiki/Lego says: "The machines that make Lego bricks have tolerances as small as 10 micrometres." For me, 3D printing resolution would need to be pretty close to that.

I don't know where you got that image, but you could always try and print the brick using the dimensions shown. Using the brick (#32316) shown in your example it might be possible to produce a 3D model using the 32316.dat file that's available in the LDraw library. The next problem would be placing the brick in a model and exporting it as a file type that ...