Drawing on the great work from bunch88 (https://www.printables.com/social/90648-bunch88/about) and his spring Coupler (https://www.printables.com/model/364379-headamame-headphones-headband-spring-coupler), I went ahead and updated it to make it a little slimmer and with recesses for M3 nuts. I used 12mm M3 screws and it works perfect. As a fellow Prusa Mini owner, its awesome that I can now print my own headbands for the sets of Head (amame) headphones.
STL and Fusion 360 files included.
The author remixed this model.