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Re:SparkFun À La Carte by amelius on Wednesday October 28, 2020 @05:34PM (#24924373)
Are you sure about Eagle being limited to 2 layers?

I found this document from 2012, which demonstrates how to do 4 layers in Eagle:

http://brc-electronics.nl/Generalfiles/Report2.pdf

Re:SparkFun À La Carte by zachm0 on Wednesday October 28, 2020 @05:58PM (#24924583)
LeifCarrotson was referring to the fact that the free version of Eagle is limited to 2 layers. You have to pay to get more than that.