Im not sure if this is a common problem with apple charging cables, but some of mine have the insulation fray closer to the connector. They still work but I worry about using them like this because I worry that the wires inside may become strained and stop working.
This is my version of a fix that has worked for me so far for about a year.
No warranty implied. Use at your own risk. etc.etc. Im just sharing what worked for me.
audio_cable_thor_v5.stl | 374.8KB |