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  • Dave Andersondanderson@hachyderm.io
    Nov 8, 2026, 6:58 AM

    Weirdly there are two different sets of dimension specs, one for blank cards and one for cards after "personalization", meaning after your face and deets get printed on them. Personalized cards have slightly looser dimensional tolerance, I assume to allow for in-spec blanks to be smushed slightly during the personalization process without going out of spec.

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  • Dave Andersondanderson@hachyderm.io
    Nov 8, 2026, 6:59 AM

    I kinda want to take calipers to all my cards now and see if they're in spec. But instead I'm going to be sensible and go to bed.

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  • Dave Andersondanderson@hachyderm.io
    Nov 8, 2026, 7:02 AM

    And no the standard doesn't say why they decided to call the smaller form factor ID-000 instead of ID-0. ID-{1,2,3} don't follow any obvious scaling rule, I suspect ISO just wrote down what a bunch of people were empirically doing.

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