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But what would the printer use it for? Keep in mind, it is sent X3G, not gcode. With X3G everything has been converted from mm to steps. As such, all adjustments of steps/mm must be done in your gcode to X3G translator.

The printer only needs to know steps/mm so that it can interpret kinematical constraints (e.g., mm/s, mm/s/s). As such, changing the steps/mm values in the printer has minimal impact. And certainly won't impact sizing of the print nor the amount of extruded plastic.