SD card holder
myminifactory
I edited Exkeks's "SD card holder insert for film canisters" model (https://www.thingiverse.com/thing:1550029). I wrapped a cylinder around the original design, filling in space for the spring. Additionally, I created a bar to secure SD cards in place. A rubber band is likely necessary to keep the bar stable. This holder can accommodate a total of 4 SD cards.
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