The Elegoo Neptune 3 Pro and Neptune 4 Max are excellent choices for your elementary and middle school STEM program because they offer user-friendly, reliable 3D printing experiences that help young students explore technology and creativity. The Neptune 3 Pro provides precision, affordability, and ease of use, making it ideal for beginners who need a smooth introduction to 3D printing. With auto-bed leveling and a quiet stepper motor, it minimizes common frustrations while delivering high-quality prints. Meanwhile, the Neptune 4 Max has a larger build volume and faster printing speeds, which allows for more ambitious projects and collaborative work in a classroom setting. Both models promote hands-on learning, problem-solving, and design skills, empowering students to bring their STEM ideas to life in a tangible, engaging way. I have both the Elegoo Neptune 3 Pro and two Neptune 4 Max 3D printers in my room. The Max is HUGE and prints very large things for an affordable price. I will say the Neptune 4 Max is NOT for beginners as the huge build plate takes some time to tweak and get ready for large prints. Once it's dialed in though.... You can get them on Amazon or direct from Elegoo.com