Super Calibration Cube

This is a "super" calibration cube, it is essentially a stack of a 10mm cube on a 20 x 20mm layer, on a 30 x 30mm layer, on a 40 x 40mm layer. To use it, print it on your printer and then use your caliper to measure accuracy in the X direction for each of the four layers, this will give you four pairs of numbers (10, "10 measurement"), (20, "20 measurement"), (30, "30 measurement"), (40, "40 measurement"). Do the same for Y, and the same for Z (see the back of the stack).

Now fit a line thr