Accuracy off by ~.030" in both X and Y

I tend to keep having my cuts off by about .030". If doing on outside contour its big and pockets are too small. Not sure if this is a stepper motor calibration issue or something else. Any ideas?

Most likely it’s an inaccurate measuring of the diameter of the endmill / runout.

Use the measured cutting diameter

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I think it ended up being a bent bit. After putting in a new one, the problem has gone away.

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