Barrel connector for metal necklace chain

Here is a barrel connector I made so I could wear the metal chain I go for Christmas safely at work (I work in dementia aged care). It uses a piece of filament to hold the ends of the chain in place after inserting them into the ends of the two connector pieces. Enjoy!

EDIT: I've updated the STL with a new, slightly tighter version for the connection, and tiny supports for the underneath to help with the model.