diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index 5e07cbe1..07bd01f2 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -1065,7 +1065,7 @@ function fs3dBuild() {
         const stubPinVisible = 200; // 밖에서 보이는 길이 (플랜지 밖)
         const stubPinInside = stubPinTotal - stubPinVisible; // 플랜지 안쪽 (100mm)
         const shaftR = b.shaftDia / 2;
-        const flangeR = shaftR * 1.4; // 플랜지 외경
+        const flangeR = shaftR; // 플랜지 외경 = 샤프트 외경 (끝에 딱 들어가는 형태)
         const flangeThick = 10; // 플랜지 두께
         const flangeMat = new THREE.MeshStandardMaterial({ color: 0x78716c, metalness: 0.5, roughness: 0.35 });
         const stubPinMat = new THREE.MeshStandardMaterial({ color: 0x9ca3af, metalness: 0.7, roughness: 0.25 });
@@ -1663,7 +1663,7 @@ function refreshPresetList() {
     // ============================
     fsCalc();
     refreshPresetList();
-    fsSwitch('Settings');
+    fsSwitch('3D');
 
 })();
 </script>