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Measuring problem

Hello,
i have a problem, i have the probe to A0 B0 , then i do the alignment and measure the dimension and everything is fine, but then i need to turn the probe to A0 B90 or 180 and measure, the dimension are not ok, they are totally wrong +-1,5mm more or less, i have all the angles calibrated, what am i doing wrong? Please help
Sorry for mu bad english