OpenSCAD is free, open-source 3D modeling software; its easy-to-use programming interface is great for beginners, because the simple design lets you quickly display and view the results of your code.

In Learn to Code with 3D Printing, OpenSCAD's creator will teach you all you need to know to design, program, and create amazing 3D-printed projects. Along the way, beginning programmers are introduced to essential programming concepts, like variables, loops, functions, and more.