BlocksCAD is a free online platform that makes it easy for students of all ages to dive right in to coding, CAD, and creating using a blocks-based interface! The tool incorporates programming and math concepts so users learn as they create. It's easy enough for elementary school students to use, but robust enough to challenge high school students. The exported stl file can then be easily 3D printed on any 3D printer, allowing you to create physical objects from your code!

For more information, see their website: https://www.blockscad3d.com
To dive right into coding: https://www.blockscad3d.com/editor/#

They also offer training and PD to learn how to use the software as well as curriculum ideas that are aligned with common core and next generation science standards!