diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index 1d39073..bd176c3 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -281,7 +281,8 @@ function GLBModel({ sceneModel, isActive }: { sceneModel: SceneModel; isActive:
           const wq = new THREE.Quaternion();
           (calGroupRef.current ?? e.object).getWorldQuaternion(wq);
           pushModelFaceNormal(n, wq);
-          if ((calibration.step as string) === 'done') {
+          // Apply / refresh calibration whenever we have ≥2 pairs.
+          if (calibration.pairs.length >= 2) {
             const q = computeCalibrationQuaternion(calibration.pairs);
             if (q) {
               useModelStore.getState().setCalibration(sceneModel.id, [q.x, q.y, q.z, q.w]);