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vryhngryctrpllr t1_itpz2g4 wrote

Measure a thread, count the # of turns it takes for it to get taken up on the spool.

Measure another thread and count turns.

Repeat and plot the data points above until you're able to fit a formula for thread length as a function of spool radius & turn count.

Use that formula.

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Dabrush OP t1_itpzje8 wrote

But that formula would break whenever there is a thread with another diameter or a spool with a different length.

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