Pogo pin connector
thingiverse
I'm using pogo pins from this link: https://www.dx.com/p/lson-2-0-3-2mm-current-pogo-pin-probe-golden-25-pcs-310969 and magnets from here: https://www.dx.com/p/5-x-2mm-ndfeb-neodymium-magnet-circular-cylinder-diy-puzzle-set-silver-50-pcs-214955.
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