Fabri-geek t1_itsytgf wrote
You first have to ask: How accurate does your measurement need to be? +/- 5%? +/-1%? +/- 0.5%?
And once the error been established, the change in the diameter of the smaller spool may be irrelevant or well within your error budget.
mnij2015 t1_ittf04a wrote
Who measures tolerances in percentages? Unless you’re trying to calculate a safety factor. +/- usually in inches or mm.
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