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This modeling project exists in two versions; a physical balsa model at 1:20 scale, and a virtual 3D computer model, the beginnings of which were modeled at the same scale in order to make plastic parts for the balsa model using a 3D printer.
Since I modeled several 3D printable parts for the physical model, I decided to keep going and create a full detailed 3D virtual model of the whole locomotive. The 3D virtual model could be translated to the real world at any scale with a 3D printer, or rendered out at any viewing angle as high resolution 2D images suitable for printing on paper. More about this in the X 31 3D Virtual Model section.