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Did you tried to print something less complicated like the 20mm calibration box? How did it come out? Do it get right dimensions in X and Y axis?

This seems to me like motor missing steps due to overcurrent or overheating.

In the line with DEFAULT_AXIS_STEPS_PER_UNIT you are missing comment // before ( - that may cause some problems too.
Also, how is it possible that you have only 42 micro steps per mm in X, Y axis and 2560 in Z axis? Even without microstepping there should be something around {102, 102, 5120, 30.8}.