>>2942344
I personally use thing:252490 and the step measurement of calipers to determine the dimension the part came out to in both X and Y axis. Measuring a step like this eliminates any "line width" related errors from the measurement.

The appropriate value to use for shrink compensation is (if percent) 100 * Nominal dimension / actual dimension.

Make sure to print the calibration object with settings that are representative of how you're going to print whatever you're actually going to use it for. Ideally, you should also calibrate skew before doing this.