diff --git a/flower_pot.py b/flower_pot.py
old mode 100644
new mode 100755
index 6211b3b..90aa65d
--- a/flower_pot.py
+++ b/flower_pot.py
@@ -5,7 +5,7 @@ import subprocess
 import sys
 from pathlib import Path
 
-from utils import ask_float
+from utils import ask_float, check_openscad
 
 
 BASE_DIR = Path(__file__).resolve().parent
@@ -42,6 +42,8 @@ def render_scad(scad_file: Path, out_file: Path, base_radius: float, wall_height
 
 
 def main() -> None:
+    check_openscad()
+
     if not SCAD_DIR.exists():
         raise SystemExit(f"Missing SCAD directory: {SCAD_DIR}")
 
diff --git a/parametric_box.py b/parametric_box.py
old mode 100644
new mode 100755
index dae5a01..32bfa94
--- a/parametric_box.py
+++ b/parametric_box.py
@@ -5,7 +5,7 @@ import subprocess
 import sys
 from pathlib import Path
 
-from utils import ask_float
+from utils import ask_float, check_openscad
 
 
 BASE_DIR = Path(__file__).resolve().parent
@@ -49,6 +49,8 @@ def render_scad(
 
 
 def main() -> None:
+    check_openscad()
+
     if not SCAD_DIR.exists():
         raise SystemExit(f"Missing SCAD directory: {SCAD_DIR}")
 
diff --git a/pill_container.py b/pill_container.py
old mode 100644
new mode 100755
index f706813..bcafceb
--- a/pill_container.py
+++ b/pill_container.py
@@ -6,7 +6,7 @@ import subprocess
 import sys
 from pathlib import Path
 
-from utils import ask_float, ask_int, ask_yes_no
+from utils import ask_float, ask_int, ask_yes_no, check_openscad
 
 
 BASE_DIR = Path(__file__).resolve().parent
@@ -70,6 +70,8 @@ def render_scad(
 
 
 def main() -> None:
+    check_openscad()
+
     if not SCAD_DIR.exists():
         raise SystemExit(f"Missing SCAD directory: {SCAD_DIR}")
 
diff --git a/seedling_tray.py b/seedling_tray.py
old mode 100644
new mode 100755
index 2147d6f..f109cd8
--- a/seedling_tray.py
+++ b/seedling_tray.py
@@ -5,7 +5,7 @@ import subprocess
 import sys
 from pathlib import Path
 
-from utils import ask_int, ask_float
+from utils import ask_int, ask_float, check_openscad
 
 
 BASE_DIR = Path(__file__).resolve().parent
@@ -54,6 +54,8 @@ def render_scad(
 
 
 def main() -> None:
+    check_openscad()
+
     if not SCAD_DIR.exists():
         raise SystemExit(f"Missing SCAD directory: {SCAD_DIR}")
 
diff --git a/utils.py b/utils.py
index c5b832d..0d9ccac 100644
--- a/utils.py
+++ b/utils.py
@@ -1,5 +1,6 @@
 #!/bin/python3
 from __future__ import annotations
+import shutil
 
 
 def ask_int(prompt: str) -> int:
@@ -39,3 +40,10 @@ def ask_yes_no(prompt: str) -> bool:
             return False
 
         print("Please enter yes or no. [y/n]")
+
+def check_openscad() -> None:
+    if shutil.which("openscad") is None:
+        raise SystemExit(
+            "OpenSCAD was not found in PATH. "
+            "Install OpenSCAD or make sure the 'openscad' command is available."
+        )
diff --git a/weave_planter.py b/weave_planter.py
index 49f3ec3..a73c23d 100755
--- a/weave_planter.py
+++ b/weave_planter.py
@@ -1,12 +1,11 @@
 #!/bin/python3
 from __future__ import annotations
 
-import shutil
 import subprocess
 import sys
 from pathlib import Path
 
-from utils import ask_float
+from utils import ask_float, check_openscad
 
 
 BASE_DIR = Path(__file__).resolve().parent
@@ -58,11 +57,7 @@ def render_scad(
 
 
 def main() -> None:
-    if shutil.which("openscad") is None:
-        raise SystemExit(
-            "OpenSCAD was not found in PATH. "
-            "Install OpenSCAD or make sure the 'openscad' command is available."
-        )
+    check_openscad()
 
     scad_file = SCAD_DIR / "weave_planter.scad"