Guides
How to program .Gcode to print in two colors: https://www.nwa3d.com/two-color-print-lesson-plan.html
How to restart a failed print: https://www.nwa3d.com/restart-a-failed-print-tutorial.html
Tinkercad tutorial: https://www.nwa3d.com/introduction-to-tinkercad.html
Common troubleshooting issues: https://www.nwa3d.com/support/faq/
Troubleshooting for advanced users: https://www.simplify3d.com/support/print-quality-troubleshooting/
Model Generation Websites
Free design programs: https://www.nwa3d.com/education/best-free-design-software-for-schools/
Free scanning programs: https://www.nwa3d.com/education/3d-scanning-basics-and-free-resources/
Free .STL topography maps: http://touchterrain.geol.iastate.edu/
Free .STL topography maps: http://jthatch.com/Terrain2STL/
Free block coding to .STL site: http://beetleblocks.com/
Educational Model Repositories
Lesson plans and tutorials: https://www.nwa3d.com/education/k-12-lesson-plans/
Lesson plans: https://www.myminifactory.com/category/education
Lesson plans: https://www.thingiverse.com/education
Lesson plans: https://www.teacherspayteachers.com/Browse/Search:3d%20printing
Smithsonian Museum 3D scans: https://3d.si.edu/
Medical models for 3D printing: https://3dprint.nih.gov/
Scan the World: https://commons.wikimedia.org/wiki/Category:STL_files_from_Scan_the_World
Case Studies, Testimonials, and Interviews
What it's like: https://www.nwa3d.com/education/3d-printing-in-education/3d-printing-in-the-classroom/
3D printing in EAST Classes: https://www.nwa3d.com/education/3d-printing-in-education/east-initiative/
Testimonials: https://www.nwa3d.com/about/testimonials/