Large calibration star

Unless you've modified your printer's drive-train, this print should simply confirm correct calibration. Any 'errors' here are most likely due to damage to the toothed-belt, different drive wheels or different steppers. It's also possible that your steppers are skipping, or the belys are jumping.

To check calibration of X and Y, this is as large as can be comfortably measured with a 6" vernier. X and Y at 140mm, with diagonals as well. Any error in X and Y ought to contribute 0.707 to the err