Keep in mind when you go to higher microstepping ratios torque goes down and your print speed may have to drop because the controller has limited steps per sec. Arduino/RAMPS can only spit out 40k pulses per sec max, combined with 256 ustepping and you find you can't turn the motor very fast. Smoothieboard can go as high as 100k pps which helps a little. Increasing microstepping ratio above 16 in a 200 step per rev motor does not increase resolution, only smoothness of rotation.
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