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Low-cost gas metal arc welding (GMAW)-based 3-D printing has proven effective at additive manufacturing steel and aluminum parts. Early success, however, was based on hand-writing G-code, which is inadequate for the majority of potential users. To enable automated slicing a 3-D model and generating G-code for an acceptable path for GMAW 3-D printing, this paper reports on upgrading of the free and...