Great little print - threads are spot on and easy to use. I did use Bambu PETG-CF for this to allow it to be used with a bit more force without breaking, but the tolerances are quite loose. Added small magnets to stop the bits falling out but this has meant the cap doesn't fully close. Maybe make the cap very slightly taller to allow more room for magnets? It would only need about another 1.5mm (see picture).

Perfect for short cables. would love a bigger one for thicker cables!