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Design is perfectly square, print is not.

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I have designed a perfectly square lid about 1/16" thick. See pic. In Sketchup, the measurements from corner to corner are exactly identical, i.e., a perfect square. When I print the lid, the measurement is not perfectly square. One corner-to-corner measurement is 20.5cm and the other corner-to-corner measurement is 20.3cm. This makes it so the lid does not fit into its spot very well.

What would cause something like this? Is the printer not calibrated properly?




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