Stl_cmd is a suite of command line tools for generating, inspecting and manipulating STL files which are often used in 3D printing. The goal of this project is to be a resource for teaching terminal usage and some basic programming concepts in the 3D printing space. Imagine an assignment which involves building a brick wall. Students would need to use a combination of stl_cube, stl_transform and stl_merge. The commands could be combined in a bash or script with for and while loops, could accept input and use conditionals to affect the attributes of the wall.