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people seem to have a low opinion of carbon fibre's ability to hold together
Not me.
I do have a low opinion of mistreating it though, which I'd say filing across the cut end is.
I dare say using a high-speed (relative to hand filing), smooth (relative to a file) abrasive around (not across) it is fine.
But that isn't what I cautioned against.
Carbon?
I'd have thought that would lead to fraying of the fibre.