The original model, credited to @Troyerse, felt a bit too thick for my liking. To refine it, I made the following adjustments:

• Reduced the thickness of the back to 2mm
• Added a camera bumper for extra protection

Print settings for case:

• 0.2mm layer height
• No supports
• 100% infill

Print settings for camera bumper:

• 0.1mm layer height
• No supports
• 100% infill

Filament: I tested it on PLA and it worked perfectly. Perhaps PETG would also work, potentially extending its lifespan due to its UV resistance.