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I think this is still an interesting question, although years ago when I first heard it asked I had not considered it, and didn't give it much thought. I noticed while designing, though, that it makes considerable difference in a few situations. Wheels for instance, and very small parts. for me the rule is a generalization, I don't split the line usually, but cut on the edge that no white shows on the part, and no black shows on the paper. It isn't so hard, I make most of my mistakes when using a blade to cut out small square parts, like a canopy frame of the zero for example, that I cut the supports also by error. You will have to solve these yourself, but it is the angle the blade is held that cuts into the support even though the tip does not appear to. If you cut partway, then rotate to cut the other way, then no worry of this.
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Glen
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