I made a little video detailing an easy method of calculating the amount (length) of filament remaining on a spool using nothing more than a ruler or tape measure and the spread sheet that I created and which is linked to in the video. For sure there are other ways of doing this but I believe this is arguably the easiest because it can be done without unloading the filament and with the spool "in situ".
Hope some of you find it useful.
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