diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index ea1e6637..a730a783 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -1123,27 +1123,27 @@ function fs3dBuild() {
         const motorBodyGeo = new THREE.CylinderGeometry(motorR, motorR, motorLen, 24);
         motorBodyGeo.rotateZ(Math.PI / 2);
         const motorBody = new THREE.Mesh(motorBodyGeo, motorMat);
-        // 복주머니 바깥쪽에 모터 배치 (브라켓 바깥)
-        const motorCenterX = motorDir * (W1 / 2 + bkW + motorLen / 2);
+        // 브라켓 안쪽(샤프트 방향)에 모터 배치 — 복주머니 옆
+        const motorCenterX = motorDir * (W1 / 2 - bkW - couplingLen - motorLen / 2);
         motorBody.position.set(motorCenterX, 0, 0);
         meshes.motor.add(motorBody);
 
-        // Motor end cap (뒷면 마감판)
+        // Motor end cap (바깥쪽 마감판 — 샤프트 반대편)
         const endCapGeo = new THREE.CylinderGeometry(motorR + 5, motorR + 5, 8, 24);
         endCapGeo.rotateZ(Math.PI / 2);
         const endCapMat = new THREE.MeshStandardMaterial({ color: 0x1e40af, metalness: 0.5, roughness: 0.3 });
         const endCap = new THREE.Mesh(endCapGeo, endCapMat);
-        endCap.position.set(motorCenterX + motorDir * (motorLen / 2 + 4), 0, 0);
+        endCap.position.set(motorCenterX - motorDir * (motorLen / 2 + 4), 0, 0);
         meshes.motor.add(endCap);
 
-        // Motor output shaft (모터 돌출축 — 모터에서 안쪽으로 돌출)
-        const outShaftR = b.shaftDia * 0.25; // 돌출축: 샤프트보다 작은 축
+        // Motor output shaft (모터 돌출축 — 모터에서 복주머니 방향으로 돌출)
+        const outShaftR = b.shaftDia * 0.25;
         const outShaftLen = 40;
         const outShaftGeo = new THREE.CylinderGeometry(outShaftR, outShaftR, outShaftLen, 16);
         outShaftGeo.rotateZ(Math.PI / 2);
         const outShaftMat = new THREE.MeshStandardMaterial({ color: 0x94a3b8, metalness: 0.8, roughness: 0.2 });
         const outShaft = new THREE.Mesh(outShaftGeo, outShaftMat);
-        outShaft.position.set(motorCenterX - motorDir * (motorLen / 2 + outShaftLen / 2), 0, 0);
+        outShaft.position.set(motorCenterX + motorDir * (motorLen / 2 + outShaftLen / 2), 0, 0);
         meshes.motor.add(outShaft);
 
         // Motor mounting legs (3개)