module trackball(x, y, z, tbBoxLength, tbDiameter, openingWidth, openingHeight, grooveWidth, grooveHeight, offset){

       
    //translate([]) cube([]);
    translate([x, y, z])
    {
        difference()
        {
            union()
            {
                translate([0,(openingWidth - grooveWidth + offset) / 2,0]) color("olive") cube([tbBoxLength, grooveWidth - offset, grooveHeight]);
        
        translate([0, offset / 2, grooveHeight]) color("green") cube([tbBoxLength, openingWidth - offset, openingHeight]);
            }
            
            translate([- offset, openingWidth / 2, openingHeight + grooveHeight]) rotate([90 + atan(24/(openingWidth/2)), 0, 0]) cube(cutBlock);
        }
 
        translate([tbBoxLength / 2, openingWidth / 2, openingHeight + grooveHeight]) color("teal") sphere(d = tbDiameter);
    }
    
}