iter-png-2/gpt-5-nano / tier-2-offset-handle-mug

```openscad
$fn = 100;

// Mug body: outer cylinder and hollow inner with bottom thickness 6
module mug_body() {
    difference() {
        cylinder(h = 90, r = 40, $fn = $fn);
        translate([0, 0, 6]) cylinder(h = 84, r = 35, $fn = $fn);
    }
}

// Handle cross-section (D-shape) in XY plane with inner hollow
module handle_cross_section() {
    Th = 30;        // thickness into +X direction
    Hh = 70;        // total height
    hole_w = 25;    // inner hollow width
    hole_h = 30;    // inner hollow height
    hole_x = Th - hole_w;
    hole_y = (Hh - hole_h) / 2;

    outer = union() {
        // D-shape: left straight edge, right semicircular edge
        square([Th, Hh], center = false);
        translate([Th, Hh/2]) circle(r = Th, $fn = $fn);
    };

    inner_hole = translate([hole_x, hole_y])
        square([hole_w, hole_h], center = false);

    difference() {
        outer;
        inner_hole;
    }
}

// Extrude the 2D handle cross-section along the X axis
module handle3d() {
    // Move the cross-section into the YZ plane, then extrude along X by rotating
    rotate([0, -90, 0]) {
        linear_extrude(height = 18) {
            handle_cross_section();
        }
    }
}

// Assemble mug with handle on the +X side
union() {
    mug_body();

    // Position the handle near the outer surface on the +X side
    translate([40, 0, 10]) handle3d();
}
```