Researchers at the Massachusetts Institute of Technology's (MIT) Computer Science and Artificial Intelligence Laboratory (CSAIL), in collaboration with Google, Stability AI, and Northeastern University, have introduced a groundbreaking generative AI tool named 'MechStyle'. This system addresses a key challenge in 3D printing personalized items: maintaining mechanical integrity and durability when aesthetic changes are made. While generative AI has revolutionized digital content creation, its application to physical objects has been limited by the difficulty of ensuring printed items are robust enough for daily use. MechStyle allows users to upload an existing 3D model or select a preset asset, such as a vase or hook, and then personalize it using text or image prompts. The generative AI modifies the 3D geometry based on these prompts, but critically, MechStyle simultaneously simulates how these design changes will affect specific parts of the object. This simulation ensures that vulnerable areas remain structurally sound, preventing the final 3D printed item from breaking under normal use. The innovation means that personalized objects can be both aesthetically pleasing and physically durable, making them suitable for real-world applications in homes, offices, and beyond. This development builds upon previous MIT CSAIL projects like 'Style2Fab' (September 2023), which focused on personalizing 3D models without compromising functionality, and other advancements in material discovery and printer capabilities. The 'MechStyle' system represents a significant step towards making digital fabrication accessible for creating functional, everyday items that truly 'sustain daily use', moving 3D printing further into practical, consumer-level applications.