Here's what 80" camo cord looks like in a 4-core 3 1/2" cobra weave FOB:

the little nibs are all that was leftover from 80".
The rest is TMI, unless you're interested in this kind of stuff !
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started with feeding cord through knife then adjust for overall FOB size.

cinch that first knot above, then weave a couple cobra knots.

then complete weaving the cobra knot down until only little loop ends remain.

had barely enough cord to finish with a lanyard knot.