Customizable Sleeve / Cover / Case

This 3D model is a practical protective sleeve designed for everyday items that tend to suffer quietly, books, notebooks, and passports. It offers a simple, rigid layer of protection against bent corners, worn edges, and general day-to-day or travel-related wear, all while maintaining a slim, unobtrusive profile.The design allows for quick access, with a dedicated cutout that makes removal easy and frustration-free. Its straightforward geometry makes it easy to print on common 3D printers and simple to adapt to different sizes.In short, it is a straightforward solution for people who want their important items to last longer without adding bulk or unnecessary complexity. Customizable Parameters include:Inner dimensions (height, width, thickness): Adjustable to fit different books, notebooks, or passports, including tolerances.Wall and base thickness: Customizable to balance strength, protection, and material usage.Cutout: Optional and fully configurable in size and rounding to improve