diameter_wheel = 180; // Diameter of the wheel (mm)
thickness_wheel = 30; // Thickness of the wheel (mm)
length_handle = 130; // Length of the handle (mm)
diameter_handle = 20; // Diameter of the handle (mm)
radius_holes_handle = 5; // Radius of holes for the handle (mm)
radius_holes_reduction = 2; // Radius of reduction holes (mm)
diameter_axle = 10; // Diameter of the central axle (mm)

// Function to create the wheel
module wheel(){
    difference() {
        // Main wheel
        cylinder(h = thickness_wheel, d = diameter_wheel, $fn = 100);
        
        // Central hole for the axle 
        translate([0, 0, -1])
            cylinder(h = thickness_wheel + 2, d = diameter_axle, $fn = 100);
        
        }
}

// Function to create the handle that passes through the central hole of the wheel
module handle(){
    // Handle passing through the central hole of the wheel
    translate([0, 0, -length_handle / 2])  
        cylinder(h = length_handle, d = diameter_handle, $fn = 50);
}

// Function to create the central axle
module central_axle(){
    cylinder(h = thickness_wheel + 20, d = diameter_axle, $fn = 50);
}

// Assembly of the wheel, handle, and central axle
translate([0, 0, 0]) {
    // Wheel
    wheel();
    
    // Handle (positioned correctly through the central hole of the wheel)
    translate([0, 0, 10])  // Position the handle in the correct place
        handle();
    
    // Central axle (added to allow the handle to rotate)
    translate([0, 0, -10]) // Correctly positions the axle
        central_axle();
}