Anyone know what is the ideal spacing between the airholes on a vacuum table? I'm going to be forming molds for concrete veneer and pavers. I'm not sure how far the holes would need to be from the edage of the master.
I have no idea the answer to your question, but I am of the opinion that you only need holes under the shape you are forming.
I can not see why there is a need to put holes outside the shape.