OpenSCAD model of CSG tree

CSG_example.scad

// Shape parameters
sphereRadius = 0.65;
cylinderRadius = 0.3;
cylinderHeight = 1.1;

// Top level difference operation
difference(){

    // Intersection of cube and sphere
    intersection(){
        
        // Red cube with unit sides
        color("red", 1.0){
            cube([1, 1, 1], center = true);
            }
        
        // Blue sphere 
        color("blue", 1){
            sphere(r = sphereRadius, $fn = 128);
            }
        }

    // Union of three cylinders centered on each axis
    color("Lime", 1.0){
        union(){
            union(){
                cylinder(h = cylinderHeight, r = cylinderRadius, $fn = 128, center = true);
                rotate([90,0,0]){
                cylinder(h = cylinderHeight, r = cylinderRadius, $fn = 128, center = true);
                }                
            }
            rotate([0,90,0]){
                cylinder(h = cylinderHeight, r = cylinderRadius, $fn = 128, center = true);
            }
        }
    }
}