Setting up the units of the scene - Blender 3D Printing ... Home,O'Reilly Media Metric units are the default standard of measurement in 3D printing. To set up Blender for Metric scaling, navigate to the Blender Properties panel and select the button with the lamp, sphere, and cylinder icon from the header as seen in the following screenshot. Then, scroll down until you see the Units subpanel. Select the Metric button, and then set the Scale option to 0.001 (thousandths of ...