new design: parameterized box with clip in lid

parametric_box.py

@@ -0,0 +1,80 @@
+#!/bin/python3
+from __future__ import annotations
+
+import subprocess
+import sys
+from pathlib import Path
+
+from utils import ask_float
+
+
+BASE_DIR = Path(__file__).resolve().parent
+SCAD_DIR = BASE_DIR / "box"
+OUT_DIR = BASE_DIR / "stl"
+
+
+def render_scad(
+    scad_file: Path,
+    out_file: Path,
+    length: float,
+    width: float,
+    height: float,
+) -> None:
+    cmd = (
+        f'openscad '
+        f'-D length={length} '
+        f'-D width={width} '
+        f'-D height={height} '
+        f'-D part="print" '
+        f'-o "{out_file}" '
+        f'"{scad_file}"'
+    )
+
+    result = subprocess.run(
+        ["bash", "-lc", cmd],
+        cwd=BASE_DIR,
+        text=True,
+        capture_output=True,
+    )
+
+    if result.returncode != 0:
+        print(f"\nFailed to render {scad_file.name}")
+        if result.stdout:
+            print(result.stdout)
+        if result.stderr:
+            print(result.stderr, file=sys.stderr)
+        raise SystemExit(result.returncode)
+
+    print(f"Generated {out_file}")
+
+
+def main() -> None:
+    if not SCAD_DIR.exists():
+        raise SystemExit(f"Missing SCAD directory: {SCAD_DIR}")
+
+    print("Dimensions less than 20mm may result in unusable STL files.\n")
+
+    length = ask_float("Box depth / length (X) in mm: ")
+    width = ask_float("Box width (Y) in mm: ")
+    height = ask_float("Box height (Z) in mm: ")
+
+    OUT_DIR.mkdir(parents=True, exist_ok=True)
+
+    box_scad = SCAD_DIR / "parametric_box.scad"
+
+    if not box_scad.exists():
+        raise SystemExit(f"Missing file: {box_scad}")
+
+    render_scad(
+        box_scad,
+        OUT_DIR / "box.stl",
+        length,
+        width,
+        height,
+    )
+
+    print("\nDone.")
+
+
+if __name__ == "__main__":
+    main()