I accuse the brake hose zip tie, in the bottom bracket, of the murder of the axle.
Axle is fine as said already, but from the second picture it looks like it's the cable outer that rubbed rather than the ziptie. Maybe it needs to be more slack/have something inserted from inside the BB shell into the chainstay to keep it low?
@giofox started
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I accuse the brake hose zip tie, in the bottom bracket, of the murder of the axle.