Pogo pin connector
thingiverse
Pogo pins : https://www.dx.com/p/lson-2-0-3-2mm-current-pogo-pin-probe-golden-25-pcs-310969 Magnets : https://www.dx.com/p/5-x-2mm-ndfeb-neodymium-magnet-circular-cylinder-diy-puzzle-set-silver-50-pcs-214955 These are the parts that I used. However, I would recommend getting better quality pogo pins from elsewhere as these have inconsistent tension and/or stronger magnets in the same size.
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