I adapted Geekdad_3D's Zippo lighter case model to accommodate the charging port for the Zippo arc insert.
It uses a piece of 1.75mm filament (or similar) for a hinge pin. While Geekdad_3D suggests resin to promote hinge strength, I've had great success using ASA or PC to get a strong hinge.
Recommend printing hollow ends up, supports on.