Select mm from the bottom of the Easel main screen to set the project units in millimeters, as indicated by the red arrow in the first image.
Next, edit the values in the X and Y Material Dimensions box, as indicated by the red box in the second image, and set them to 165mm.
Set the Z dimension as the thickness of your material using the Material Dimensions box, shown in yellow in the second image.
Next, set your material type by selecting the Material tab, as indicated by the purple square in the third image. Then, select the material type your preview will display.
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