I teach high school research at magnet STEM school. Students are moving from engineering science fair projects that use conventional materials to ones that they can custom print with (ship hulls, wing profiles, rocket shape). I am also printing out equipment we use in our lab like the conical tube holders. We have been having students design and print playground equipment for their engineering class. I hope as the school acquires more printers we can move to a whole engineering class on rapid prototyping.