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— The 2-roller with the finer crush had a lot of grains pulverized to a flour-like consistency. With the MM-3 at 0.035" gap, I achieved a mash efficiency of 78%. With only a 2% difference to the first run with the 2-roller mill, this could very well have just been measurement variation. 035-inch 3-Roller Mill Close-up 035-inch 3-Roller Mill ...