diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index 1386e94e..5b2bf7dd 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -1241,7 +1241,7 @@ function fs3dBuild() {
         const motorR = b.shaftDia * 0.45;
         const shaftSprocketR = 70; // 브라켓 높이(180mm) 내 크기 (ø140)
         const motorSprocketR = 30; // 모터측 작은 스프로켓 (ø60)
-        const motorZ = -(shaftSprocketR + motorSprocketR + 20); // 모터 Z 오프셋 (-Z = 셔터박스 뒤쪽)
+        const motorZ = -(shaftSprocketR + motorSprocketR + 170); // 모터 Z 오프셋 (슬랫 감김 간섭 방지 +150mm)
         // 브라켓: Z 중심은 샤프트(0)와 모터(motorZ) 사이
         const motorBkGeo = new THREE.BoxGeometry(motorBkThick, motorBkH, motorBkW);
         const motorBk = new THREE.Mesh(motorBkGeo, bracketMat);