bare/gpt-5.4-nano / tier-1-mug

// Mug with hollow interior and ring handle
$fn = 128;

outer_d = 80;
outer_r = outer_d/2;

body_h = 100;
wall_t = 4;

bottom_t = 6;

handle_r = 12;       // radius of the ring handle (extrudes outward from the cup)
handle_th = 10;     // handle ring thickness (in the Z direction after rotation)
handle_z  = 50;     // center height of the handle on the mug

inner_r = outer_r - wall_t;
inner_h = body_h - bottom_t; // hollow starts above the bottom thickness

module ring_handle(r=12, z=50, ring_th=10, hole_d=18){
    // A ring (torus-like) oriented so it protrudes radially from the cup wall.
    // We'll create it by rotating a 2D annulus profile around the X axis direction.
    // In this construction, the ring's center is at the mug's side (x = outer_r),
    // so we translate it outward by r.
    rotate([0,90,0]) // rotate so ring is in Y-Z plane and protrudes in +X
    translate([0,0,0]) 
    difference(){
        // Outer torus (generated by revolving a circle)
        torus( rOuter=r + ring_th, rInner=r + ring_th - 1, z=z);
    }
}

// Helper: create a torus by sweeping a circle along a radius
module torus(rOuter, rInner, z=0){
    // rOuter: major radius, rInner: minor radius (approx using outer circle - inner circle)
    // We'll implement as a difference of two spheres swept by linear_extrude? Instead use rotate_extrude annulus:
    // Use rotate_extrude with an annulus cross-section positioned at radius rOuter.
    // Minor radius approximated: use (rOuter - rInner) as thickness; if small, still fine.
    minor = max(0.1, (rOuter - rInner));
    // Cross-section: circle(s) of radius minor about origin, then translate out by rOuter
    // We'll build as an annulus torus: outer and inner subtraction.
    difference(){
        rotate_extrude(angle=360)
            translate([rOuter, 0, z])
                circle(r=minor);
        // inner cut to form ring hole (if ring thickness enough)
        if (minor - 3 > 0)
        rotate_extrude(angle=360)
            translate([rOuter, 0, z])
                circle(r=minor-3);
    }
}

module mug(){
    difference(){
        // Outer body
        cylinder(h=body_h, r=outer_r);

        // Hollow interior
        translate([0,0,bottom_t])
            cylinder(h=inner_h, r=inner_r);
    }
}

difference(){
    // Mug body
    mug();

    // No subtractive operations beyond the hollow are needed here;
    // keep handle addition outside this difference to remain simple.
}

// Add handle as a union with the mug
union(){
    mug();

    // Handle ring placement:
    // Place ring so it protrudes outward from the cup side.
    // We'll position the ring center at (x=outer_r + handle_r/2, y=0, z=handle_z),
    // with the ring's axis along the radial direction via rotation.
    //
    // Use a torus created from an annulus profile with major radius = handle_r
    // and minor radius controlled by handle_th.
    //
    // We'll center the ring at the cup's side by translating its major radius beyond outer_r.
    translate([outer_r + (handle_r/2), 0, handle_z])
        rotate([0,90,0])
            difference(){
                // Outer ring (torus-like)
                rotate_extrude(angle=360)
                    translate([handle_r, 0, 0])
                        circle(r=handle_th/2);
                // Inner hole
                rotate_extrude(angle=360)
                    translate([handle_r, 0, 0])
                        circle(r=handle_th/2 - 2.5);
            }
}