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Where pads connect directly to very large planes (typically ground) a thermal relief is added. Due to the high density of parts many smaller polygons do not feature thermal reliefs to pads, since they would take up a significant portion of the polygon area.
Component Designators
Component designators have largely been omitted from the layout due to space constraints. The usefulness of designators decreases with increasing board size, as having “C57” among hundreds of 0603 parts does not make it easier to find. Eventually the “Top Designator” layer will be updated with all designators so that they are included in the PDF export.