Cadwalk

The online OpenSCAD customizer with live sliders

Every annotated OpenSCAD variable becomes a slider below.

Copy the prompt.
Paste it into an AI chat (Gemini, ChatGPT, Claude, etc.).
Add what you want to model — see the example loaded below.

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// Sample parametric model: a pirate ship cannon and a cat head
// Adjust the sliders, or paste your own OpenSCAD model over this.

/* [Overall] */
model_scale = 100; // [40:5:250]

/* [Barrel] */
barrel_length = 180; // [80:1:300]
breech_diameter = 46; // [24:1:90]
muzzle_diameter = 32; // [16:1:70]
bore_diameter = 19; // [6:0.5:44]
muzzle_swell = 5; // [0:0.5:14]
reinforce_step = 2.5; // [0:0.1:8]
ring_width = 9; // [2:0.5:20]
vent_diameter = 3; // [0:0.1:8]

/* [Breech] */
cascabel_diameter = 22; // [8:0.5:44]
cascabel_neck = 11; // [4:0.5:24]

/* [Trunnions] */
trunnion_diameter = 17; // [6:0.5:32]
trunnion_length = 42; // [10:0.5:75]
trunnion_position = 40; // [15:1:70]
trunnion_setback = 16; // [0:1:60]

/* [Cat head] */
cat_head_length = 46; // [15:1:90]
cat_head_width = 62; // [20:1:110]
cat_head_height = 56; // [20:1:100]
cat_jowl_radius = 15; // [4:0.5:30]
cat_jowl_spread = 16; // [4:0.5:36]
cat_nose_size = 7; // [0:0.5:16]
cat_eye_size = 8; // [0:0.5:18]
cat_eye_spread = 15; // [4:0.5:34]
cat_brow_thickness = 3; // [0:0.1:9]
cat_mouth_size = 11; // [0:0.5:24]
cat_head_offset_x = -14; // [-200:1:200]
cat_head_offset_y = -92; // [-260:1:260]
cat_head_turn = 28; // [-180:1:180]

/* [Cat ears] */
cat_ear_height = 27; // [0:1:60]
cat_ear_width = 28; // [6:1:50]
cat_ear_thickness = 7; // [2:0.5:14]
cat_ear_spread = 17; // [4:0.5:40]
cat_ear_splay = 22; // [0:1:55]
cat_ear_lean = 4; // [-40:1:40]

/* [Carriage] */
cheek_length = 140; // [60:1:220]
cheek_height = 40; // [20:1:80]
cheek_thickness = 11; // [4:0.5:24]
cheek_gap = 52; // [26:1:110]
carriage_steps = 4; // [2:1:7]
step_drop = 20; // [0:1:40]

/* [Wheels] */
wheel_diameter = 30; // [14:1:60]
wheel_thickness = 11; // [4:0.5:24]
axle_diameter = 11; // [4:0.5:22]

/* [Quoin] */
quoin_length = 44; // [0:1:90]
quoin_height = 14; // [2:0.5:34]
quoin_width = 30; // [10:1:60]

/* [Quality] */
$fn = 48; // [16:8:120]

/* [Hidden] */
r_breech = breech_diameter / 2;
r_muzzle = muzzle_diameter / 2;
r_chase = breech_diameter * 0.43;

// Carriage sits on its trucks; the trunnions ride at the top of the cheeks,
// and the barrel is hung off that one point so the two always line up.
wheel_r = wheel_diameter / 2;
cheek_bottom_z = wheel_diameter * 0.55;
cheek_front = cheek_length * 0.44;
cheek_offset = cheek_gap / 2 + cheek_thickness / 2;
wheel_y = cheek_offset + cheek_thickness / 2 + wheel_thickness / 2;
step_len = cheek_length / carriage_steps;
front_axle_x = cheek_front - step_len * 0.45;
rear_axle_x = cheek_front - cheek_length + step_len * 0.45;
bed_top = cheek_bottom_z + 9;

barrel_z = cheek_bottom_z + cheek_height;
trunnion_x = cheek_front - trunnion_setback;
barrel_x0 = trunnion_x - barrel_length * trunnion_position / 100;

// Head is modelled around an origin level with its mouth, then lifted so it
// rests on the deck.
cat_head_cx = cat_head_length * 0.30;
cat_head_cz = cat_head_height * 0.20;
cat_head_lift = cat_head_height * 0.30;

// Front surface of the head at a point, so the eyes, nose and brows can be
// laid onto it instead of guessed at.
function cat_face_x(y, z) = cat_head_cx + cat_head_length * 0.55
  * sqrt(max(0, 1 - pow(y / (cat_head_width / 2), 2)
               - pow((z - cat_head_cz) / (cat_head_height / 2), 2)));

// Barrel profile, revolved: thick breech, first reinforce ring, tapering
// chase, muzzle astragal, then the flared muzzle swell.
barrel_profile = [
  [0, 0],
  [r_breech, 0],
  [r_breech, barrel_length * 0.24],
  [r_breech + reinforce_step, barrel_length * 0.24],
  [r_breech + reinforce_step, barrel_length * 0.24 + ring_width],
  [r_chase, barrel_length * 0.24 + ring_width],
  [r_muzzle, barrel_length * 0.84],
  [r_muzzle + reinforce_step, barrel_length * 0.84],
  [r_muzzle + reinforce_step, barrel_length * 0.84 + ring_width],
  [r_muzzle, barrel_length * 0.84 + ring_width],
  [r_muzzle, barrel_length * 0.93],
  [r_muzzle + muzzle_swell, barrel_length * 0.93],
  [r_muzzle + muzzle_swell, barrel_length],
  [0, barrel_length]
];

// Built breech-at-origin pointing up +z; the assembly lays it down along +x.
module barrel_solid() {
  rotate_extrude(convexity = 10) polygon(points = barrel_profile);
  // rounded breech end
  scale([1, 1, 0.65]) sphere(r = r_breech);
  // cascabel: neck and knob hanging off the back
  hull() {
    translate([0, 0, -r_breech * 0.55]) sphere(r = cascabel_neck / 2);
    translate([0, 0, -r_breech * 0.55 - cascabel_neck])
      sphere(r = cascabel_diameter / 2);
  }
  // trunnions, with a raised rimbase where they meet the barrel
  for (s = [-1, 1])
    translate([0, 0, barrel_length * trunnion_position / 100])
      rotate([-90 * s, 0, 0]) {
        cylinder(h = trunnion_length, d = trunnion_diameter);
        cylinder(h = trunnion_length * 0.3, d = trunnion_diameter * 1.5);
      }
}

// Bore and vent, in the same breech-at-origin frame.
module barrel_cuts() {
  translate([0, 0, barrel_length * 0.22])
    cylinder(h = barrel_length * 0.82, d = bore_diameter);
  translate([0, 0, barrel_length * 0.27]) rotate([0, -90, 0])
    cylinder(h = breech_diameter, d = vent_diameter);
}

// Cat's head as its own piece, facing +x, with the origin level with the
// mouth so the assembly can just stand it on the deck.
module cat_head() {
  difference() {
    cat_head_solid();
    // open mouth, scooped out of the whisker pads
    mouth_z = cat_head_height * 0.02;
    translate([cat_face_x(0, mouth_z) - cat_mouth_size * 0.2, 0, mouth_z])
      scale([1, 1.1, 0.85]) sphere(r = cat_mouth_size);
  }
}

module cat_head_solid() {
  translate([cat_head_cx, 0, cat_head_cz])
    scale([cat_head_length * 0.55, cat_head_width / 2, cat_head_height / 2])
      sphere(r = 1);
  // whisker pads, straddling the mouth
  hull()
    for (s = [-1, 1])
      translate([cat_face_x(s * cat_jowl_spread, cat_head_height * 0.06)
                 - cat_jowl_radius * 0.55, s * cat_jowl_spread, cat_head_height * 0.06])
        sphere(r = cat_jowl_radius);
  // nose
  nose_z = cat_head_height * 0.26;
  translate([cat_face_x(0, nose_z) - cat_nose_size * 0.3, 0, nose_z])
    scale([0.8, 1.2, 0.9]) sphere(r = cat_nose_size);
  // eyes and brow ridges
  eye_z = cat_head_height * 0.48;
  for (s = [-1, 1]) {
    translate([cat_face_x(s * cat_eye_spread, eye_z) - cat_eye_size * 0.4,
               s * cat_eye_spread, eye_z])
      scale([0.5, 1, 0.85]) sphere(r = cat_eye_size);
    translate([cat_face_x(s * cat_eye_spread, eye_z + cat_eye_size) - cat_brow_thickness,
               s * cat_eye_spread, eye_z + cat_eye_size])
      scale([0.6, 1.6, 1]) sphere(r = cat_brow_thickness);
  }
  for (s = [-1, 1])
    translate([cat_head_length * 0.14, s * cat_ear_spread, cat_head_height * 0.56])
      rotate([-s * cat_ear_splay, cat_ear_lean, 0])
        cat_ear(s);
}

// Tapered ear: a deep, wide base thinning to a rounded tip that leans away
// from the skull, so it still reads as an ear edge-on.
module cat_ear(s) {
  hull() {
    scale([cat_ear_thickness, cat_ear_width / 2, cat_ear_thickness * 0.5])
      sphere(r = 1);
    translate([0, s * cat_ear_width * 0.30, cat_ear_height * 0.5])
      scale([cat_ear_thickness * 0.6, cat_ear_thickness * 0.5, cat_ear_thickness * 0.5])
        sphere(r = 1);
    translate([0, s * cat_ear_width * 0.16, cat_ear_height])
      scale([cat_ear_thickness * 0.38, cat_ear_thickness * 0.6, cat_ear_thickness * 0.6])
        sphere(r = 1);
  }
}

// One side bracket of the carriage: a staircase of blocks dropping away
// toward the rear, the way a truck carriage is cut.
module cheek(s) {
  for (i = [0 : carriage_steps - 1])
    translate([cheek_front - (i + 0.5) * step_len, s * cheek_offset,
               cheek_bottom_z + cheek_height * (1 - i * step_drop / 100) / 2])
      cube([step_len + 1, cheek_thickness,
            cheek_height * (1 - i * step_drop / 100)], center = true);
}

// Bed plank and the two transoms that tie the cheeks together.
module carriage_frame() {
  translate([cheek_front - cheek_length * 0.5, 0, cheek_bottom_z + 4.5])
    cube([cheek_length, cheek_gap + cheek_thickness, 9], center = true);
  for (x = [cheek_front - 7, cheek_front - cheek_length + 7])
    translate([x, 0, cheek_bottom_z + cheek_height * 0.3])
      cube([14, cheek_gap + cheek_thickness, cheek_height * 0.6], center = true);
}

module trucks() {
  for (x = [front_axle_x, rear_axle_x]) {
    translate([x, 0, wheel_r]) rotate([90, 0, 0])
      cylinder(h = wheel_y * 2 + wheel_thickness, d = axle_diameter, center = true);
    for (s = [-1, 1])
      translate([x, s * wheel_y, wheel_r]) rotate([90, 0, 0]) {
        cylinder(h = wheel_thickness, d = wheel_diameter, center = true);
        cylinder(h = wheel_thickness * 1.6, d = wheel_diameter * 0.3, center = true);
      }
  }
}

// Elevation wedge under the breech.
module quoin() {
  hull() {
    translate([barrel_x0 + 4, 0, bed_top + quoin_height / 2])
      cube([9, quoin_width, quoin_height], center = true);
    translate([barrel_x0 + 4 - quoin_length, 0, bed_top + quoin_height * 0.15])
      cube([9, quoin_width, quoin_height * 0.3], center = true);
  }
}

scale(model_scale / 100)
  difference() {
    union() {
      translate([barrel_x0, 0, barrel_z]) rotate([0, 90, 0]) barrel_solid();
      translate([cat_head_offset_x, cat_head_offset_y, cat_head_lift])
        rotate([0, 0, cat_head_turn]) cat_head();
      for (s = [-1, 1]) cheek(s);
      carriage_frame();
      trucks();
      quoin();
    }
    translate([barrel_x0, 0, barrel_z]) rotate([0, 90, 0]) barrel_cuts();
  }

Rendering…

Overall

model_scale100

Barrel

barrel_length180

breech_diameter46

muzzle_diameter32

bore_diameter19.0

muzzle_swell5.0

reinforce_step2.5

ring_width9.0

vent_diameter3.0

Breech

cascabel_diameter22.0

cascabel_neck11.0

Trunnions

trunnion_diameter17.0

trunnion_length42.0

trunnion_position40

trunnion_setback16

Cat head

cat_head_length46

cat_head_width62

cat_head_height56

cat_jowl_radius15.0

cat_jowl_spread16.0

cat_nose_size7.0

cat_eye_size8.0

cat_eye_spread15.0

cat_brow_thickness3.0

cat_mouth_size11.0

cat_head_offset_x-14

cat_head_offset_y-92

cat_head_turn28

Cat ears

cat_ear_height27

cat_ear_width28

cat_ear_thickness7.0

cat_ear_spread17.0

cat_ear_splay22

cat_ear_lean4

Carriage

cheek_length140

cheek_height40

cheek_thickness11.0

cheek_gap52

carriage_steps4

step_drop20

Wheels

wheel_diameter30

wheel_thickness11.0

axle_diameter11.0

Quoin

quoin_length44

quoin_height14.0

quoin_width30

Quality

$fn48

Orientation

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