Issues with 3D models

[aszklerortho]

Hello, my name is Angela and I work for an orthodontist. We have 2 Moonray S100 printers and we 3D print dental models of patients teeth and use them to make retainers. We purchased our first one about 3 years ago so I've been working with them since them. One of the printers has started to distort the models so that they are wider by the molars when printing horizontally. The model looks fine but when compared with a reprint you can notice the difference. I have done the Fit and Tolerance and the Dimensional Accuracy calibrations since it started happening and they have not fixed the issue. I've attached some pictures for reference.