I am trying a new fab (Elecrow), and they emailed me and said my board has short circuits. They attached this image:
But my board passes DRC, and also I had fabbed an extremely similar (though slightly different) version of the board previously with another fab, and it works. And since Elecrow does not have the netlist, just the Gerbers, I’m not sure how they can tell what is a short anyway?
It looks like most of what they are highlighting are cases where a track is redundant with a filled zone. (Wouldn’t this be fairly common, though? Am I doing something unusual here?) There are a couple of places where I am doing something unusual: I added redundant tracks in an attempt to anchor some pads, because I’d had trouble with them delaminating in an earlier version.
I’m tempted to just tell them that it is correct and they should fab it anyway. But is there anything I should beware of? Am I doing something I shouldn’t be doing? Does anyone recognize the tool they’re using to find these “shorts”?