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All things considered, and I know it was mentioned that permanently altering the mold wasn't desired, but a straight-edge and an X-acto blade would/should take care of venting without the need to run a machine. Now that would rely on the hardness of the mold steel, but I would venture a guess that it isn't tempered tool steel. Vent lines aren't anything more substantial than uniform "scratches" that run from the cavity to the edge.
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