Protection for this tiny itzi-bitzi Lightning-to-3,5 Jack Adapter by Apple, which will break in a week when used in a pocket...
Print both parts, put the adapter (the cord arranged like a 'S') in it, glue both parts together (try not to glue the Adapter itself) and let it dry under pressure.
Please print in high resolution (should take up to 1 hour per part).
Glue the parts tightly together. Try to remove printing overspill where the cord will go.