Finally, your favorite PCB layout tool may not support four-layer boards. Eagle’s free version is limited to two layers, as is Fritzing. If you use a hobbyist-oriented package, you’ll need to ...
[Stuart Patterson] presents his guide for Advanced PCB Graphics in KiCAD 6.0 and Inkscape ... you want for the silkscreen layer, solder mask removal layers and any non-circuit copper.
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