diff --git a/knob/.gitignore b/knob/.gitignore
new file mode 100644
index 0000000..d5f19d8
--- /dev/null
+++ b/knob/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+package-lock.json
diff --git a/knob/README.md b/knob/README.md
new file mode 100644
index 0000000..9a7b4fc
--- /dev/null
+++ b/knob/README.md
@@ -0,0 +1 @@
+Knob model
diff --git a/knob/body.js b/knob/body.js
new file mode 100644
index 0000000..f277221
--- /dev/null
+++ b/knob/body.js
@@ -0,0 +1,75 @@
+'use strict';
+
+const jscad = require('@jscad/modeling');
+const { colorize, hexToRgb } = jscad.colors;
+const { polygon, cuboid, roundedCuboid, cylinder, cylinderElliptic, roundedCylinder } = jscad.primitives;
+const { union, subtract, intersect } = jscad.booleans;
+const { translate, translateX, translateY, translateZ, rotate, rotateX, rotateY, rotateZ } = jscad.transforms;
+const { extrudeLinear, extrudeFromSlices, slice } = jscad.extrusions;
+const { mat4 } = jscad.maths;
+const { hull, hullChain } = jscad.hulls;
+
+const outerKnob = () => subtract(
+  cylinderElliptic({height: 21, startRadius: [12, 12], endRadius: [11, 11], center: [0, 0, 21 / 2 + 3], segments: 36}),
+  cylinder({radius: 9, height: 2, center: [0, 0, 24], segments: 64}),
+  cylinder({radius: 4.05,  height: 12, center: [0, 0, 20], segments: 64}),
+  cylinderElliptic({height: 8, startRadius: [10, 10], endRadius: [2, 2], center: [0, 0, 13], segments: 64}),
+  cylinderElliptic({height: 6, startRadius: [11, 11], endRadius: [10, 10], center: [0, 0, 6], segments: 64}),
+  translateZ(19,
+    rotateX(Math.PI / 2,
+      cylinder({radius: 1, height: 40, center: [0, 0, 20]}),
+    )
+  ),
+  ...Array.from({length: 18}, (e, i) => Math.PI * 2 * (i + 0.5) / 18)
+    .map(angle => rotateZ(angle,
+      translate([11.8, 0, 16],
+        rotateY(-.05,
+          roundedCylinder({height: 18, radius: 1, roundRadius: 0.5})
+        )
+      )
+    ))
+);
+
+const outerInsert = () => translateZ(19,
+  subtract(
+    cylinder({radius: 4, height: 8}),
+    cylinder({radius: 3, height: 8})
+  )
+);
+
+const innnerKnob = () => translateZ(24, // 26
+  subtract(
+    cylinderElliptic({height: 14, startRadius: [8, 8], endRadius: [7.6, 7.6], center: [0, 0, 7], segments: 44}),
+    cylinder({radius: 5.7 / 2, height: 11, center: [0, 0, 5], segments: 64}),
+    translateZ(5,
+      rotateX(Math.PI / 2,
+        cylinder({radius: 1, height: 40, center: [0, 0, 20]}),
+      )
+    ),
+    ...Array.from({length: 11}, (e, i) => Math.PI * 2 * (i + 0.25) / 11)
+    .map(angle => rotateZ(angle,
+      translate([8, 0, 10],
+        rotateY(0,
+          roundedCylinder({height: 15, radius: 1, roundRadius: 0.5})
+        )
+      )
+    ))
+
+  )
+);
+
+const innerInsert = () => translateZ(24,
+  subtract(
+    cylinder({radius: 5.7 / 2, height: 10, center: [0, 0, 5]}),
+    cylinder({radius: 3.45 / 2, height: 10, center: [0, 0, 5]})
+  )
+);
+
+const main = () => [
+  colorize(hexToRgb('#aaaaff'), outerKnob()),
+  colorize(hexToRgb('#ffccaa'), outerInsert()),
+  colorize(hexToRgb('#ffaaaa'), innnerKnob()),
+  colorize(hexToRgb('#ffccaa'), innerInsert()),
+];
+
+module.exports.main = main;
diff --git a/knob/gen-stl.js b/knob/gen-stl.js
new file mode 100755
index 0000000..bb00936
--- /dev/null
+++ b/knob/gen-stl.js
@@ -0,0 +1,28 @@
+#!/usr/bin/env node
+'use strict';
+
+const process = require('process');
+const path = require('path');
+const fs = require('fs');
+
+const commander = require('commander');
+const stlSerializer = require('@jscad/stl-serializer');
+
+commander
+  .requiredOption('-m, --model <path>', 'input OpenJsCad model to render')
+  .option('-o, --output-stl <path>', 'output STL file to save')
+  .parse(commander.argv);
+
+const options = commander.opts();
+
+const model = require(path.join(process.cwd(), options.model));
+
+const raw = stlSerializer.serialize({binary: true}, model.main());
+
+const stl = Buffer.concat([Buffer.from(raw[0]), Buffer.from(raw[1]), Buffer.from(raw[2])]);
+
+if (options.outputStl) {
+  fs.writeFileSync(options.outputStl, stl);
+} else {
+  process.stdout.write(stl);
+}
diff --git a/knob/knob-inner-v1.stl b/knob/knob-inner-v1.stl
new file mode 100644
index 0000000..278a6e7
Binary files /dev/null and b/knob/knob-inner-v1.stl differ
diff --git a/knob/knob-outer-v1.stl b/knob/knob-outer-v1.stl
new file mode 100644
index 0000000..c988a7e
Binary files /dev/null and b/knob/knob-outer-v1.stl differ
diff --git a/knob/package.json b/knob/package.json
new file mode 100644
index 0000000..701e826
--- /dev/null
+++ b/knob/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "xapoh-knob",
+  "version": "0.1.0",
+  "description": "",
+  "main": "body.js",
+  "scripts": {
+    "test": "eslint body.js"
+  },
+  "author": "",
+  "license": "MIT",
+  "eslintConfig": {
+    "extends": "@drom/eslint-config/eslint8/node12"
+  },
+  "devDependencies": {
+    "@drom/eslint-config": "^0.12.0",
+    "@jscad/stl-serializer": "^2.1.12",
+    "commander": "^9"
+  }
+}