Marathon Chip - I obtained a tracking chip, and modeled it so it could be recreated out of modeling foam and turned in at the Boston Marathon finish line to receive a medal they don't give to unregistered runners.
My Recreation - Here are 2 of 4 of the chips I created for fellow runners and me. A screw was added to achieve a more convincing weight.
Real Chip - A yellow version of the ChampionChip that was used to model my recreation months later.
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Marathon Chip