I Don't Understand a DRC Error Message

[paulvdh]

You can do a bit of reading from this forum search:

https://forum.kicad.info/search?expanded=true&q=IPC-7351C%20rounded%20pads

And among the search results:

Why Rounded rectangular pads in place of rectangular pads

The general goal of IPC is to allow users to easily switch their manufacturers. So very high on their list is to improve portability and reduction of manufacturer dependent variables. Reasons i remember as stated in IPC: Rounded corners in stencils improve manufacturability (less process dependency as you define the radius not the tool used). Also for stencils rounded corners improve how well the paste is released from the stencil (I did not fully understand the physics behind this but i assu…