diff --git a/knob.json b/knob.json
new file mode 100644
index 0000000..3b51e8b
--- /dev/null
+++ b/knob.json
@@ -0,0 +1,47 @@
+{
+    "parameterSets": {
+        "design default values": {
+            "$fn": "180",
+            "Depth": "4",
+            "Diameter": "101.6",
+            "Inner_pattern": "c",
+            "Inner_pattern_depth": "1",
+            "Inner_pattern_width": "24.5",
+            "Inset": "true",
+            "Inset_depth": "1",
+            "Inset_width": "15"
+        },
+        "hdd-2.5-v1": {
+            "$fn": "180",
+            "Depth": "4",
+            "Diameter": "101.6",
+            "Inner_pattern": "c",
+            "Inner_pattern_depth": "1",
+            "Inner_pattern_width": "24.5",
+            "Inset": "true",
+            "Inset_depth": "1.5",
+            "Inset_width": "15"
+        },
+        "steampunk knob": {
+            "$fn": "64",
+            "Base_depth": "30",
+            "Base_diameter": "30",
+            "Head_import": "\/home\/kienan\/Downloads\/button_steampunk_2.STL",
+            "Head_rotate_x": "90",
+            "Head_rotate_y": "0",
+            "Head_rotate_z": "0",
+            "Head_scale_x": "2",
+            "Head_scale_y": "2",
+            "Head_scale_z": "2",
+            "Head_style": "stl",
+            "Head_translate_x": "-30.4",
+            "Head_translate_y": "30.3",
+            "Head_translate_z": "28",
+            "Screw_length": "20",
+            "Screw_size": "M4",
+            "Sphere_diameter": "50",
+            "Sphere_offset": "40"
+        }
+    },
+    "fileFormatVersion": "1"
+}
diff --git a/knob.scad b/knob.scad
new file mode 100644
index 0000000..4987059
--- /dev/null
+++ b/knob.scad
@@ -0,0 +1,47 @@
+include <lib/BOSL2/std.scad>
+include <lib/BOSL2/screws.scad>
+
+Base_diameter = 30.0; // 0.1
+Base_depth = 30.0; // 0.1
+Screw_size = "M4";
+Screw_length = 15.0; // 0.1
+Head_style = "sphere"; // ["sphere", "stl"]
+Sphere_diameter = 50.0; // 0.1
+Sphere_offset = 40.0; // 0.1
+Head_import = "";
+Head_rotate_x = 0.0; // 0.1
+Head_rotate_y = 0.0; // 0.1
+Head_rotate_z = 0.0; // 0.1
+Head_scale_x = 1.0; // 0.1
+Head_scale_y = 1.0; // 0.1
+Head_scale_z = 1.0; // 0.1
+Head_translate_x = 0.0; // 0.1
+Head_translate_y = 0.0; // 0.1
+Head_translate_z = 0.0; // 0.1
+$fn = 64;
+
+module thing() {
+  union() {
+    cylinder(Base_depth, d=Base_diameter);
+    if (Head_style == "sphere") {
+        translate([0, 0, Sphere_offset]) {       sphere(d=50);
+        };
+    }
+    if (Head_style == "stl") {
+        translate([Head_translate_x, Head_translate_y, Head_translate_z]) {
+        rotate([Head_rotate_x, Head_rotate_y, Head_rotate_z]) {
+        scale([Head_scale_x, Head_scale_y, Head_scale_z]) {
+            import(Head_import);
+        }
+    }
+}
+    }
+  }  
+}
+
+difference() {
+  thing();
+  translate([0, 0, Screw_length/2]) {
+      screw_hole(Screw_size, tolerance="tap", length=Screw_length);
+  }
+};