 BEIJING, April 28, 2021 PRNewswire -- ReTo Eco-Solutions, Inc. NASDAQ: RETO ReTo or the Company, a provider of technology solutions for the improvement of ecological environments, today provided updates for its joint RD demonstration in the Beijing Winter Olympics national key project the Project , which is the result of the collaborative efforts with the Academy of Arts Design at Chinas prestigious Tsinghua University. The RD team has designed and developed a 3D printer using solid industrial waste, and the printer has been assembled and tested. 