From b485555fb40a90d1d7d41a963dcaca77cb3c2266 Mon Sep 17 00:00:00 2001
From: "U. Bruhin" <urbibruhin@bluewin.ch>
Date: Tue, 7 Oct 2025 11:29:12 +0200
Subject: [PATCH] Add script for generating buzzer 3D models

---
 generate_buzzer_smt.py | 67 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 generate_buzzer_smt.py

diff --git a/generate_buzzer_smt.py b/generate_buzzer_smt.py
new file mode 100644
index 0000000..16c0caa
--- /dev/null
+++ b/generate_buzzer_smt.py
@@ -0,0 +1,67 @@
+"""
+Generate only the 3D models for SMT buzzers
+"""
+
+from os import path
+
+import cadquery as cq
+
+from cadquery_helpers import StepAssembly
+
+
+def generate(
+    name: str,
+    body_width: float,
+    body_length: float,
+    body_height: float,
+    body_chamfer: float,
+    body_color: cq.Color,
+    hole_diameter: float,
+    hole_depth: float,
+) -> None:
+    print(f'Generating pkg 3D model "{name}"')
+
+    assembly = StepAssembly(name)
+
+    body = (
+        cq.Workplane('XY', origin=(0, 0, body_height / 2))
+        .box(body_width, body_length, body_height)
+        .edges('|Z')
+        .chamfer(body_chamfer)
+        .edges()
+        .chamfer(0.1)
+    )
+    body = body.workplane(origin=(0, 0), offset=body_height / 2).cylinder(
+        hole_depth * 2, hole_diameter / 2, centered=(True, True, True), combine='cut'
+    )
+    assembly.add_body(body, 'body', body_color)
+
+    membran = cq.Workplane('XY', origin=(0, 0, body_height - hole_depth)).cylinder(
+        0.2, hole_diameter / 2
+    )
+    assembly.add_body(membran, 'membran', cq.Color('gainsboro'))
+
+    pads_height = 0.2
+    pads = cq.Workplane('XY', origin=(0, 0, 0.02 + pads_height / 2)).box(
+        body_width - 0.2, body_length - 0.2, pads_height
+    )
+    assembly.add_body(pads, 'pads', cq.Color('burlywood'))
+
+    # Save without fusing for massively better minification!
+    out_path = path.join('out_3d', 'buzzer', f'{name}.step')
+    assembly.save(out_path, fused=False)
+
+
+if __name__ == '__main__':
+    # CUI CSS-I4B20-SMT-TR
+    # https://www.sameskydevices.com/product/resource/css-i4b20-smt-tr.pdf
+    generate(
+        name='CSS-I4B20-SMT-TR',
+        body_width=8.7,  # 8.5 according datasheet, but real device has ~8.8mm
+        body_length=8.7,  # 8.5 according datasheet, but real device has ~8.8mm
+        body_height=3.0,
+        body_chamfer=1.5,
+        body_color=cq.Color('beige'),
+        hole_diameter=5.0,  # measured from real device
+        hole_depth=0.8,  # measured from real device
+    )