diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index 7986191c..2579282f 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -1059,22 +1059,17 @@ function fs3dBuild() {
 
         // 환봉 길이 = bracket inner → shaft end gap
         const roundBarLen = 60;
-        // 주축 길이 = 양쪽 환봉/복주머니 사이 (전체 폭 - bracket*2 - 환봉 - 복주머니)
-        const mainShaftLen = W1 - bkW * 2 - roundBarLen - couplingLen;
+        const nonMotorSide = -motorDir; // 모터 반대쪽
+        // 주축 길이 = 비모터측(bracket+환봉) + 모터측(복주머니) 제외
+        const mainShaftLen = W1 - bkW - roundBarLen - couplingLen;
 
-        // --- Left Bracket ---
-        const bkGeoL = new THREE.BoxGeometry(bkW, bkH, bkD);
-        const bkMeshL = new THREE.Mesh(bkGeoL, bracketMat);
-        bkMeshL.position.set(-W1 / 2 + bkW / 2, 0, 0);
-        meshes.shaft.add(bkMeshL);
-
-        // --- Right Bracket ---
-        const bkMeshR = new THREE.Mesh(bkGeoL.clone(), bracketMat);
-        bkMeshR.position.set(W1 / 2 - bkW / 2, 0, 0);
-        meshes.shaft.add(bkMeshR);
+        // --- Non-motor side Bracket (모터 반대쪽만 브라켓 존재) ---
+        const bkGeo = new THREE.BoxGeometry(bkW, bkH, bkD);
+        const bkMesh = new THREE.Mesh(bkGeo, bracketMat);
+        bkMesh.position.set(nonMotorSide * (W1 / 2 - bkW / 2), 0, 0);
+        meshes.shaft.add(bkMesh);
 
         // --- Non-motor side: 환봉 (round bar, thin cylinder) ---
-        const nonMotorSide = -motorDir; // 모터 반대쪽
         const rbGeo = new THREE.CylinderGeometry(roundBarDia / 2, roundBarDia / 2, roundBarLen, 16);
         rbGeo.rotateZ(Math.PI / 2);
         const rbMesh = new THREE.Mesh(rbGeo, shaftMat);
@@ -1098,15 +1093,15 @@ function fs3dBuild() {
         cpGeo.rotateZ(Math.PI / 2);
         const cpMat = new THREE.MeshStandardMaterial({ color: 0x78716c, metalness: 0.7, roughness: 0.2 });
         const cpMesh = new THREE.Mesh(cpGeo, cpMat);
-        const cpCenterX = motorDir * (W1 / 2 - bkW - couplingLen / 2);
+        const cpCenterX = motorDir * (W1 / 2 - couplingLen / 2);
         cpMesh.position.set(cpCenterX, 0, 0);
         meshes.shaft.add(cpMesh);
-        // 플랜지 링 (모터측 결합면)
+        // 플랜지 링 (모터 출력축과의 결합면)
         const flangeGeo = new THREE.CylinderGeometry(couplingDia / 2 + 10, couplingDia / 2 + 10, 6, 24);
         flangeGeo.rotateZ(Math.PI / 2);
         const flangeMat = new THREE.MeshStandardMaterial({ color: 0x57534e, metalness: 0.8, roughness: 0.2 });
         const flange = new THREE.Mesh(flangeGeo, flangeMat);
-        flange.position.set(motorDir * (W1 / 2 - bkW - 3), 0, 0);
+        flange.position.set(motorDir * (W1 / 2 - 3), 0, 0);
         meshes.shaft.add(flange);
 
         meshes.shaft.position.set(0, shaftY, 0);
@@ -1123,7 +1118,7 @@ function fs3dBuild() {
         const motorBodyLen = motorR * 2.5; // 본체 길이
         const gearBoxLen = motorR * 1.2; // 기어박스 길이
         const totalMotorLen = motorBodyLen + gearBoxLen;
-        const motorStartX = motorDir * (W1 / 2 - bkW - couplingLen); // 복주머니 끝
+        const motorStartX = motorDir * (W1 / 2 - couplingLen); // 복주머니 끝 (모터측 브라켓 없음)
         const motorMidX = motorStartX - motorDir * totalMotorLen / 2; // 모터 전체 중심
 
         // 1) 모터 본체 (은색 원통 — 메인 실린더)