Case Design for Wearable device

I need to design a small suitable round wearable case for a USB and battery-powered device, PCB size in ~ 40mm diameter. You will need to provide an STL and Solidworks file so I can do a 3D print. Please refer to the picture attached of how it approximately should look. I build one using a plastic cap from a pepper grinder. Additionally, some straps need to be added on the sides to wear and hold the device around the hand. I will provide more details later as well as a step file for the PCB hole mounting and size.