Living hinge watch band/bracelet; uses 1.75mm filament or wire for connecting them end to end. Your mileage may vary; a minor % increase in scale may ...help with difficult filament feed inside barrel connectors.
I was designing this for use with a bracelet/band as well as a connecting system for a wrap belt for use with keeping custom 3D printable Bento Box compartments together. Still developing a decent clasp system for the end...