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I think this is the document (attached) mastabug was saying, in case you're not a member and can't access it. Also, if you have Marlin firmware, there is a whole section on Bed Skew Compensation with instructions on how to enter the values obtained by printing https://www.thingiverse.com/thing:2563185, but of course getting the frame as square as possible first is probably better.

Hope this helps.

YACS (Yet Another Calibration Square