How big can you go with high-end industrial 3D printers? VERY big! Here is a wind blade mold for research in wind power.
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Source:
http://energy.gov/eere/amo/articles/global-wind-day-2016-amo-s-role-applying-3d-printing-wind-blade-mold-manufacturing
The mold for making the blades is being printed using the Big Area Additive Manufacturing (BAAM) machine at the Manufacturing Demonstration Facility (MDF) at Oak Ridge National Laboratory. BAAM is 500 to 1,000 times faster and capable of printing polymer components 10 times larger than today’s industrial additive manufacturing machines. Since the molds will be used to create research blades measuring 13 meters (42 feet) in length, BAAM provides the necessary scale and foundation for this ground-breaking advancement in blade research and manufacturing.
Source:
http://energy.gov/eere/amo/articles/global-wind-day-2016-amo-s-role-applying-3d-printing-wind-blade-mold-manufacturing