radiusA = 20; //Radius of helper grove [cm]
height_main = 20; //Height of helper grove [cm]

Nturns = 1; //How much turns should the helper have.
//Slide size
sideX = 2;
sideY = 2;

turns = 360*Nturns;

//Smoothness
smoothness = 5;
$fn = 20;

thickness = 1.0;

offset_between_parts=1.5;

skirtZ = 0.1*(thickness*2.0);


module line3D(p1, p2, thickness) {

    hull() {
        translate(p1) sphere(thickness / 2);
        translate(p2) sphere(thickness / 2);
    }
}

module polyline3D(points, thickness) {
    module polyline3D_inner(points, index) {
        if(index < len(points)) {
            line3D(points[index - 1], points[index], thickness, fn);
            polyline3D_inner(points, index + 1);
        }
    }

    polyline3D_inner(points, 1);
}

points = [
    for(a = [0:smoothness:360 * Nturns]) 
        [radiusA * cos(a), radiusA * sin(a), height_main / (360 / smoothness) * (a / smoothness)]
];

color("red"){
    difference(){
        polyline3D(points, thickness);
        
        
        translate([-radiusA-sideX, -radiusA-sideY, +height_main/2+skirtZ*4]){
            cube([radiusA*2+sideX*2,radiusA*2+sideY*2,height_main/2+skirtZ*4]);
        }
    }
}

color("blue"){
    translate([0, radiusA*2 +offset_between_parts, -height_main/2]){
        difference(){
            polyline3D(points, thickness);
            translate([-radiusA-sideX, -radiusA-sideY, -skirtZ*4]){
                cube([radiusA*2+sideX*2,radiusA*2+sideY*2,height_main/2+skirtZ*4]);
            }
        }
    }
}