Sheet metal stamping should level to ensure accuracy and consistency in the stamping process. This is important because uneven metal can cause variations in the thickness and shape of the stamped parts, leading to defects or inconsistencies in the final product. Leveling the metal helps to ensure that the stamping process produces parts that are uniform in size, shape, and quality. Additionally, leveling can help to reduce the amount of material waste and increase the efficiency of the stamping process.