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These connect individual layers of the board with a ... submerging the entire PCB. After an initial experiment showed promising results, [Levi] committed to a full prototype.

[Carl] wanted to prototype his circuits quickly using printed circuit boards. He picked up a Bantam Tools Desktop PCB Mill and made a video about the results. His first attempt wasn’t perfect ...

While this prototype still wasn't a full-fledged single-board computer ... all on a credit card-sized PCB. In December 2011, ...