I have a data about different kinds of cylinders(radius of 1,2, and 3 inches) that are produced from 3D printer. On Minitab, I made the normality plot but it is not normal. I also tried to make Box-Cox transformation, still it doesn't work. Its scatter plot is like an ellipse. I have the data about x and y coordinates, radius and angles. Do you have any idea how can I fit a correct model at first on Minitab? I am open for all advices. If you want, I can also send the data set with mail. Thank you!