Cura : Rotating, scaling, and slicing
Learn how to open your STL file, rotate and scale your part. Finally Cura slices the model, and we'll learn how to save G-code to the microSD card.
G code is the machine language the CNC machines and 3D printers use to move their "end effector" (in this case 3D print nozzle end) in 3-axes.
3D printers use metric system millimeters for their unit of measure. If you prepared your drawing in a different system it may need to be significantly resized from being much to small or much too large.