If you are looking for 3d printing project ideas and curriculum, Stratasys has many free educational resources – you just have to know where to look for them and be willing to give Stratasys your contact info to download the lesson plans and project ideas.
From what I can tell, Stratasys is a company that focuses on providing 3d printing solutions for industrial use. If you download any curriculum from them, you will probably receive an e-mail or two within a few days asking how they can help you with your 3d printing needs. The inquiries are worth it, however, in order to have access to the activities and lessons you can use with your students.
I have downloaded the Lessons and Project Ideas, Semester Curriculum, and 3d Printing Modules. Depending on the experience of your students, most of the resources are good for middle and high school students. You can integrate them into a STEAM curriculum, use them as stand-alone lessons, or make them accessible to students in your Maker Space to jump start some ideas.