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  "path": "/2026/05/16/21st-century-punch-cards-are-3d-printed-and-read-by-opencv/",
  "publishedAt": "2026-05-16T20:00:55.000Z",
  "site": "https://hackaday.com",
  "tags": [
    "classic hacks",
    "computer hacks",
    "3d print",
    "computer vision",
    "opencv",
    "punch card",
    "…read more"
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  "textContent": "While a punch card is perhaps the lowest-density storage medium available, it has some distinct advantages. As [Bitroller] points out in the write-up of his punch card project, if he …read more",
  "title": "21st Century Punch Cards are 3D Printed and Read By OpenCV"
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