diff --git a/.gitignore b/.gitignore
index 9a9d0a8..6aec11a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 stl/
+__pycache__/
diff --git a/flower_pot.py b/flower_pot.py
index ff016b9..6211b3b 100644
--- a/flower_pot.py
+++ b/flower_pot.py
@@ -5,24 +5,14 @@ import subprocess
 import sys
 from pathlib import Path
 
+from utils import ask_float
+
 
 BASE_DIR = Path(__file__).resolve().parent
 SCAD_DIR = BASE_DIR / "flower_pot"
 OUT_DIR = BASE_DIR / "stl"
 
 
-def ask_float(prompt: str) -> float:
-    while True:
-        try:
-            value = float(input(prompt).strip())
-            if value <= 0:
-                print("Please enter a positive number.")
-                continue
-            return value
-        except ValueError:
-            print("Please enter a valid number.")
-
-
 def render_scad(scad_file: Path, out_file: Path, base_radius: float, wall_height: float, wall_height_tray: float) -> None:
     cmd = (
         f'openscad '
diff --git a/seedling_tray.py b/seedling_tray.py
new file mode 100644
index 0000000..d0402c0
--- /dev/null
+++ b/seedling_tray.py
@@ -0,0 +1,97 @@
+#!/bin/python3
+from __future__ import annotations
+
+import subprocess
+import sys
+from pathlib import Path
+
+from utils import ask_int, ask_float
+
+
+BASE_DIR = Path(__file__).resolve().parent
+SCAD_DIR = BASE_DIR / "seedlings_tray"
+OUT_DIR = BASE_DIR / "stl"
+
+
+def render_scad(
+    scad_file: Path,
+    out_file: Path,
+    cols: int,
+    rows: int,
+    cell_size: float,
+    tray_height: float,
+    render_mode: str,
+) -> None:
+    cmd = (
+        f'openscad '
+        f'-D cols={cols} '
+        f'-D rows={rows} '
+        f'-D cell_size={cell_size} '
+        f'-D tray_height={tray_height} '
+        f'-D \'render_mode="{render_mode}"\' '
+        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 20 mm may result in unusable STL files.\n")
+
+    cols = ask_int("Number of columns (cols): ")
+    rows = ask_int("Number of rows (rows): ")
+    cell_size = ask_float("Inner cell size in mm (cell_size): ")
+    tray_height = ask_float("Tray height in mm (tray_height): ")
+
+    OUT_DIR.mkdir(parents=True, exist_ok=True)
+
+    scad_file = SCAD_DIR / "seedlings-tray.scad"
+    if not scad_file.exists():
+        raise SystemExit(f"Missing file: {scad_file}")
+
+    # Render the tray only
+    render_scad(
+        scad_file,
+        OUT_DIR / "seedlings-tray.stl",
+        cols,
+        rows,
+        cell_size,
+        tray_height,
+        "tray_only",
+    )
+
+    # Render all plates in a grid
+    render_scad(
+        scad_file,
+        OUT_DIR / "plates.stl",
+        cols,
+        rows,
+        cell_size,
+        tray_height,
+        "plates_only",
+    )
+
+    print("\nDone.")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/utils.py b/utils.py
new file mode 100644
index 0000000..306ef10
--- /dev/null
+++ b/utils.py
@@ -0,0 +1,28 @@
+#!/bin/python3
+from __future__ import annotations
+
+
+def ask_int(prompt: str) -> int:
+    """Prompt user for a positive integer."""
+    while True:
+        try:
+            value = int(input(prompt).strip())
+            if value <= 0:
+                print("Please enter a positive integer.")
+                continue
+            return value
+        except ValueError:
+            print("Please enter a valid integer.")
+
+
+def ask_float(prompt: str) -> float:
+    """Prompt user for a positive float."""
+    while True:
+        try:
+            value = float(input(prompt).strip())
+            if value <= 0:
+                print("Please enter a positive number.")
+                continue
+            return value
+        except ValueError:
+            print("Please enter a valid number.")