HOUSTON--(BUSINESS WIRE)--Changing Technologies, Inc. (OTCBB: CHGT) has tabbed Marco Valenzuela as its new president and CEO and charged him with continuing the company’s steady progress towards its aggressive product delivery goals for 2015. Valenzuela had been guiding CHGT 3D printing subsidiary 6thDimension Technologies (6D3D) and brings a wealth of valuable industry connections, knowledge and experience into his expanded role. “The 3D printing market continues to explode and my goal is to e
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