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Replying to @MichaelStal and @oshpark

The original SAMD51-based version (linked) is in its final form. Thing is, I realized that in designing it with so many bells & whistles I probably made it more expensive to manufacture than I intended. This new board tests a simpler, lower cost variation. https://www.tindie.com/products/joeycastillo/the-open-book-pcb-bare-pcb/

(original)