To be honest, I don't care about this too much as long as it prints cleanly. I feel like it's mostly a marketing number, and most brand name filaments have pretty consistent tolerances anyway.
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And one more thing: The maximum tolerance is one thing, but it doesn't tell you about consistency. A filament that has a tolerance of 0.03, but with only very gradual deviations in a few spots might print better than one with 0.02 but a very inconsistent diameter that's all over the place.
Also, when a manufacturer puts a tolerance on their website, I don't just take it at face value. I don't even know how accurate their measurement tools are, and if their QC would catch spools that exceed these tolerances.
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