Sheet metal flattening design is an integral component of sheet metal fabrication, focused on producing efficient and precise flat patterns for various applications. The design phase involves translating 3D parts or components into 2D flat patterns which can then be cut out and formed with sheet metal sheets. Attention must be paid to material properties, geometric restrictions and manufacturing processes when designing products from composite materials. Designing with sheet metal requires using computer-aided design (CAD) software to generate and modify a three dimensional model, before applying sheet metal-specific design principles to produce its flat pattern counterpart. Key factors of sheet metal flattening design include accounting for material thickness, bend allowances and corner reliefs as well as including tabs, notches and flanges for proper assembly. The aim of sheet metal flattening design should be to optimize manufacturing process efficiency while simultaneously achieving high precision and functionality in final product.