HellAlex model is brilliant. Perfect for my need: to hold two cards that are frequently used throughout the day. It fits safely and the space between the cards is about 7.5mm, which is great for the proximity sensors I have to interact.

In this remix, I edited the hinge to make it tighter and print-in-place. But that was a personal choice, I think the original hinge is perfectly fine.
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The author remixed this model.