OpenSCAD Tutorial

Most OpenSCAD models are a few primitives combined with three boolean operations. This is called constructive solid geometry (CSG).

• union() merges its children. Top-level shapes are unioned automatically, but an explicit union groups them.
• difference() keeps the first child and subtracts every child after it.
• intersection() keeps only the volume shared by all children.

Common mistake: putting the cutter first. The part you keep always comes first inside difference().

Your task: change the union() to a difference() so the sphere scoops out the middle of the cube, leaving only its corners.