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An efficient and low cost experiment was conducted to investigate the influence of grain size effects on springback of thin sheet metal. A three-point bending setup was used to test Aluminum 1100 O-Temper and Brass 26000 1/2 Hard (H02). Thickness and average grain diameter were controlled to achieve a range of desired T/D (thickness/grain diameter) ratios because T/D ratio is a key factor that influences the springback behavior in micro sheet forming. The results from this experiment show that as T/D ratio becomes smaller (T/D > 1 → 1) the springback amount increases at a decreasing slope. And as T/D continues to become even smaller (T/D < 1) the springback amount begins to decrease. These behaviors demonstrate the influence of size effects on springback.