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heimerdinger
Right, the 1.04166666666666666.... - on the x/y (and z, technically, but that's not so important) this would leave an infinitesimally small fraction of a micron left over, shifting each layer by that much, correct? I know visually it wouldn't be noticeable between each layer but with a tall enough object / enough layers it would add up and lead to a small deformity every x number of layers. (poorly attempted ASCII illustration below)
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that 0.000001 something microns would stack up and after enough layers it would jump back to start, leaving a more noticable difference, and a weird pattern where one is not intended. That is how he explained it to me, I believe.
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That said I have been lurking various forums/threads and I think I'll give it a shot with the 7.5 steppers, worst case I just buy some 1.8's, best case I have a functional printer without buying new motors! :D
Thanks for the help.
Further discussion is welcome.
With RepRapFirmware (and I suspect with most other firmwares too), there will be no "jump" in X and Y. As with all printers, there will be a "jump" in Z if you choose a layer height that is not an exact number of microsteps (and preferably an exact number of quarter steps too).