You need to change the third value in the DEFAULT_AXIS_STEPS_PER_UNIT define in Configuration.h
#define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200.0*8/3,760*1.1} // default steps per unit for Ultimaker
The values are X, Y, Z and E and the formula is using the Z value as an example:
200.0*8/3
200 - full steps per rev
8 - number of microsteps
3 - pitch
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Dim3nsioneer 557
It's actually 200*8/8 but you got it... depending on which Marlin version you're using you don't even have to recompile the firmware; you may just use a M92 command (and an M500 to save it).
If you build a heated bed, you have to change the settings for the heated bed and the bed temperature sensor as well.
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