HOUSTON--(BUSINESS WIRE)--Changing Technologies, Inc. (OTCBB: CHGT) recently attended Houston’s Space City ComicCon 2015, one of the largest pop-culture expos in the Southwestern U.S., and discussed 3D printing and design services with enthusiastic members of the growing global cosplay community. “This hobby represents a rapidly expanding market with strong revenue potential for a company like ours,” said CHGT CEO Marco Valenzuela. “These fans are quite passionate, spending large sums to buy ac