This is a really nice design. Thank you!
The top part was printed with 0.15 mm layer height with the first two layers in DAS FILAMENT glow-in-the-dark PLA, other layers with Fillamentum PLA Extrafill "Luminous Orange". The two bottom bracelet covers with WillowFlex "Apricot Orange".
The concave areas in the top part caused slight but acceptable warping. The actuators for the buttons needed a bit of rework after print as they collided with the case and could not be pressed deep enough reach the switches. Some holes for better visibility of the status LED would also be nice. Otherwise this is a fine design and I'm happy you gave this to the community.
multiple: DAS FILAMENT, Fillamentum, WillowFlex PLA and whatever WillowFlex is made of
multiple: Glow-Grün V2, Luminous Orange, Apricot Orange