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The issue is that the "standard" botstep stepper drivers shipped with MightyBoards can only supply a maximum of 0.77A, and that's if you modify the firmware to allow a digipot setting of 127. The firmwares for MightyBoards limit it to a digipot setting of 118 which limits to 0.72A.

So, if you use stepper motors requiring more current, then you have to use different stepper drivers. And the MightyBoard doesn't use a standard pinout. Thus, in all likelihood, you must modify whatever alternate stepper driver you use. For example, if you use a Pololu A4988, you have to modify it. See, e.g., https://www.flickr.com/photos/d-newman/sets/72157654553957262 .