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Have you run the camera calibration routine? A half inch is a pretty big margin of error!
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Did you use “set focus,” or else enter the correct material height? I can’t tell for sure because of the angle of the photo, but it seems a little less on the left than on the right, which indicates the focal height is off.
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Any chance the head has gotten moved or bumped since your last print? That could also account for the large margin of error.
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