EduChange President Catherine Saldutti presented at EDULearn 17, the 9th annual International Conference on Education and New Learning Technologies hosted in Barcelona, Spain in July 2017. The presentation, entitled Open but not Free: Sustainable Open Educational Resources (SOER) in a Secondary/Polytechnic STEM Curriculum, examines the groundbreaking new model for educational content creation, developed by EduChange. The discussion of OER is gaining speed, but there are few viable business models in the space. The creation of high-quality educational content is expensive, yet teachers also need the ability to modify content for their own purposes. In the area of STEM, the content itself changes. This presentation explores the ways in which our model utilizes Comprehensive Anticipatory Design Science and over 485 teaching and learning variables to create a robust SOER program that schools and institutions pay to establish and maintain.