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> micrometer tolerances

That's really not that much (1-999 μm). Keep in mind that sub-1mm is micrometer, and 1mm is a huge distance. I'm sure that LEGO bricks have tolerances of single or low double digits of micrometers...




https://en.wikipedia.org/wiki/Lego#Manufacturing

The moulds are permitted a tolerance of up to two micrometres, to ensure the bricks remain connected.




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