diff --git a/oc-patches/customize-bowden-length/README.md b/oc-patches/customize-bowden-length/README.md
new file mode 100644
index 0000000..04f8f11
--- /dev/null
+++ b/oc-patches/customize-bowden-length/README.md
@@ -0,0 +1,17 @@
+# Bowden Tube Length Patch
+
+## Summary
+Binary patching of 0x2c81f8 performed to update the bowden tube length from 700mm to any desired value
+
+---
+
+## Verification
+- [x] Confirm patched binary boots normally  
+- [x] Confirm print pauses correctly after filament runout sensor trips  
+- [x] Verify pause timing is nearly immediate after trip event  
+
+---
+
+## TODO
+- [x] Write parameterized script to accept user-entered Bowden length values  
+~~- Generate and apply `bsdiff` at runtime~~ 
diff --git a/oc-patches/customize-bowden-length/patch.py b/oc-patches/customize-bowden-length/patch.py
new file mode 100755
index 0000000..5f7dc17
--- /dev/null
+++ b/oc-patches/customize-bowden-length/patch.py
@@ -0,0 +1,119 @@
+#!/usr/bin/env python3
+# - Only tested on 1.1.40 app binary
+
+import os
+import re
+import sys
+import struct
+import shutil
+from pathlib import Path
+
+# -------------------------------------------------------------------
+BASE_VA = 0x00010000
+TARGET_VA = 0x02C81F8
+EXPECTED_BEFORE = bytes.fromhex("0000000000E08540")   # original val for 700mm
+DEFAULT_MM = 700                                      # may need to be changed in future hardware/firmware iterations
+# -------------------------------------------------------------------
+
+# rootcheck
+if hasattr(os, "geteuid") and os.geteuid() != 0:
+    print("Error: please run as root.", file=sys.stderr)
+    sys.exit(1)
+
+# env/path
+project_root = os.environ.get("REPOSITORY_ROOT")
+squashfs_root = os.environ.get("SQUASHFS_ROOT")
+
+if not project_root or not squashfs_root:
+    print("Error: REPOSITORY_ROOT and SQUASHFS_ROOT must be set in the environment.", file=sys.stderr)
+    sys.exit(1)
+
+project_root = Path(project_root)
+squashfs_root = Path(squashfs_root)
+
+# --- read BOWDEN_LENGTH_MM from patch_config and validate ---
+cfg_file = project_root / "oc-patches" / "patch_config"
+
+try:
+    text = cfg_file.read_text(encoding="utf-8", errors="replace")
+    m = re.search(r'^BOWDEN_LENGTH_MM\s*=\s*([^\r\n#]+)', text, flags=re.MULTILINE)
+except FileNotFoundError:
+    print("[INFO] Config not found; skipping patch.")
+    sys.exit(0)
+
+if not m:
+    print("[INFO] BOWDEN_LENGTH_MM not found; skipping patch.")
+    sys.exit(0)
+
+# sanitize
+bowden_raw = m.group(1).strip()
+if not re.fullmatch(r'\d+', bowden_raw):
+    print("[INFO] BOWDEN_LENGTH_MM invalid (non-integer); skipping patch.")
+    sys.exit(0)
+
+bowden_mm = int(bowden_raw, 10)
+if not (10 <= bowden_mm <= 999):
+    print("[INFO] BOWDEN_LENGTH_MM invalid (needs integer 10–999); skipping patch.")
+    sys.exit(0)
+
+# get app
+app_dir = squashfs_root / "app"
+orig = app_dir / "app"
+work = app_dir / "app-patch"
+
+if not orig.is_file():
+    print(f"ERROR: target file not found: {orig}", file=sys.stderr)
+    sys.exit(1)
+
+shutil.copyfile(orig, work)
+
+# Hex setup
+try:
+    data = bytearray(work.read_bytes())
+except Exception as e:
+    print(f"ERROR: failed to read working file: {e}", file=sys.stderr)
+    sys.exit(1)
+
+file_off = TARGET_VA - BASE_VA
+if file_off < 0 or file_off + 8 > len(data):
+    print(f"ERROR: invalid offset 0x{file_off:X}", file=sys.stderr)
+    sys.exit(1)
+
+before = bytes(data[file_off:file_off+8])
+
+# Confirm location
+if before != EXPECTED_BEFORE:
+    print(
+        f"ERROR: pre-patch bytes mismatch at 0x{file_off:X}\n"
+        f"       found    {before.hex().upper()}\n"
+        f"       expected {EXPECTED_BEFORE.hex().upper()}\n"
+        f"       → skipping Bowden patch (bytes don't match, unsafe)",
+        file=sys.stderr
+    )
+    work.unlink(missing_ok=True)
+    sys.exit(0)
+
+# write new double bytes
+data[file_off:file_off+8] = struct.pack('<d', float(bowden_mm))
+
+# write back to work file
+try:
+    work.write_bytes(data)
+except Exception as e:
+    print(f"ERROR: failed to write working file: {e}", file=sys.stderr)
+    sys.exit(1)
+
+# Replace
+bak = orig.with_suffix(".bak")
+try:
+    shutil.copyfile(orig, bak)
+    shutil.move(str(work), str(orig))
+except Exception as e:
+    print(f"ERROR: failed to replace original app: {e}", file=sys.stderr)
+    sys.exit(1)
+
+old_mm = struct.unpack('<d', before)[0]
+new_hex = data[file_off:file_off+8].hex().upper()
+print(f"[INFO] Patch successful — Bowden length set to {bowden_mm} mm  "
+      f"-  (DEBUG - 0x{TARGET_VA:X} updated from {before.hex().upper()} ({old_mm:.3f} mm) "
+      f"to {new_hex} ({float(bowden_mm):.3f} mm))")
\ No newline at end of file
diff --git a/oc-patches/customize-bowden-length/patch.toml b/oc-patches/customize-bowden-length/patch.toml
new file mode 100644
index 0000000..22184a6
--- /dev/null
+++ b/oc-patches/customize-bowden-length/patch.toml
@@ -0,0 +1,6 @@
+id   = "bowden_length"
+name = "Customize bowden tube length"
+compatible_versions = ["1.1.40"]
+after = ["base"]
+run = ["./patch.py"]
+execution_policy = "Always"
\ No newline at end of file
diff --git a/oc-patches/patch_config b/oc-patches/patch_config
index 5af2746..844bb9c 100644
--- a/oc-patches/patch_config
+++ b/oc-patches/patch_config
@@ -26,3 +26,4 @@ HOME_POSITION_FRONT_RIGHT=true
 REPLACE_BOOTLOGO=true
 SET_FIRMWARE_VERSION=true
 ALWAYS_ALLOW_Z_OFFSET_ADJUST=true
+#BOWDEN_LENGTH_MM=700
\ No newline at end of file