I think the "correct" way to do this is for the file to hold information that exactly describes the solder paste. You need the three dimensional shape. Plan view and thickness.
How to cut a stencil so as to get the above is not part of the layout but part of the "process". I see two steps. (1) create the solder past specs based whatever information may be available and helpful The abount oand shape of the paste depends on the part and the size of the pad. A user could specify some rules but reasonable default rules should be built in. Just using the pad size is a rather crude rules but a decent start. (2) The sticil is made based on the shape and volume of the paste. There should be rules that translate past size/volume to stencil shape and again the user can change some parameters The bottom line is that pad != paste != stencil. The relationships are dependent on the process -- ===== Chris Albertson Redondo Beach, California
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