diff --git a/src/libslic3r/BuildVolume.cpp b/src/libslic3r/BuildVolume.cpp
index 894b892..0915de1 100644
--- a/src/libslic3r/BuildVolume.cpp
+++ b/src/libslic3r/BuildVolume.cpp
@@ -389,24 +389,29 @@ BuildVolume::ObjectState BuildVolume::volume_state_bbox(const BoundingBoxf3 volu
 BuildVolume::ObjectState BuildVolume::check_outside(Polygon hull) const
 {
     //y21
-    const Vec3d bed_offset = s_multiple_beds.get_bed_translation(s_multiple_beds.get_active_bed());
-    if (m_exclude_bed_shape.size() > 0) {
-    for (int i = 1; i < m_exclude_bed_shape.size(); i += 7) {
-        std::vector<Vec2d> tem_exclude_bed_shap;
-        for (int j = 1; j < 6; j++)
-            tem_exclude_bed_shap.push_back(Vec2d{ m_exclude_bed_shape[i + j].x()+ bed_offset.x(), m_exclude_bed_shape[i + j].y()+ bed_offset.y()});
-        BoundingBoxf tem_bboxf = get_extents(tem_exclude_bed_shap);
-        auto                    tem_exclude_bboxf = BoundingBoxf3{to_3d(tem_bboxf.min, 0.), to_3d(tem_bboxf.max, m_max_print_height)};
-            Slic3r::Polygon p                 = tem_exclude_bboxf.polygon(true); // instance convex hull is scaled, so we need to scale here
-            if (intersection({p}, {hull}).empty() == false) {
-                return ObjectState::Colliding;
-            break;
-        }
+    int beds_num = s_multiple_beds.get_number_of_beds();
+    for (int i = 0; i < beds_num; i++)
+    {
+        const Vec3d bed_offset = s_multiple_beds.get_bed_translation(i);
+        if (m_exclude_bed_shape.size() > 0) {
+            for (int i = 1; i < m_exclude_bed_shape.size(); i += 7) {
+                std::vector<Vec2d> tem_exclude_bed_shap;
+                for (int j = 1; j < 6; j++)
+                    tem_exclude_bed_shap.push_back(Vec2d{ m_exclude_bed_shape[i + j].x() + bed_offset.x(), m_exclude_bed_shape[i + j].y() + bed_offset.y() });
+                BoundingBoxf tem_bboxf = get_extents(tem_exclude_bed_shap);
+                auto                    tem_exclude_bboxf = BoundingBoxf3{ to_3d(tem_bboxf.min, 0.), to_3d(tem_bboxf.max, m_max_print_height) };
+                Slic3r::Polygon p = tem_exclude_bboxf.polygon(true); // instance convex hull is scaled, so we need to scale here
+                if (intersection({ p }, { hull }).empty() == false) {
+                    return ObjectState::Colliding;
+                    break;
+                }
             }
-        return ObjectState::Inside;
-    } else {
-        return ObjectState::Inside;
+        }
+        else {
+            return ObjectState::Inside;
+        }
     }
+    return ObjectState::Inside;
 }
 
 //B52
diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index 4a116f3..46ad4ef 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -384,6 +384,9 @@ public:
     // Whether or not this object is printable
     bool                    printable { true };
 
+    //y21
+    bool                    in_exclude{ false };
+
     // This vector holds position of selected support points for SLA. The data are
     // saved in mesh coordinates to allow using them for several instances.
     // The format is (x, y, z, point_size, supports_island)
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 3acec38..0b46850 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1544,21 +1544,22 @@ bool GLCanvas3D::check_volumes_outside_state(GLVolumeCollection& volumes, ModelI
                 state = BuildVolume::ObjectState::Below;
             else {
                 switch (build_volume.type()) {
-                    // B66
                 case BuildVolume::Type::Rectangle:
                     //FIXME this test does not evaluate collision of a build volume bounding box with non-convex objects.
                     state = build_volume.volume_state_bbox(volume_bbox(*volume), true, &bed_idx);
+                    // B66 //y21
                     if (state == BuildVolume::ObjectState::Inside) {
-                        for (size_t i = 0; i < m_model->objects.size(); ++i) {
-                            ModelObject *  object   = m_model->objects[i];
-                            ModelInstance *instance = object->instances[0];
-                            Polygon        hull     = instance->convex_hull_2d();
-
-                            state = build_volume.check_outside(hull);
-                            if (state != BuildVolume::ObjectState::Inside) {
-                                break;
-                            }
+                        int obj_idx = volume->object_idx();
+                        ModelObjectPtrs model_parts = wxGetApp().model().objects;
+                        ModelObject* model_obj = model_parts[obj_idx];
+                        ModelInstance* instance = model_obj->instances[0];
+                        Polygon        hull = instance->convex_hull_2d();
+                        state = build_volume.check_outside(hull);
+                        if (state != BuildVolume::ObjectState::Inside) {
+                            model_obj->in_exclude = true;
                         }
+                        else
+                            model_obj->in_exclude = false;
                     }
                     break;
                 case BuildVolume::Type::Circle:
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index d3556d6..e1cbe04 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -1895,11 +1895,12 @@ void Plater::priv::object_list_changed()
             for (const ModelObject *object : wxGetApp().model().objects) {
                 for (const ModelInstance *instance : object->instances) {
                     const auto it{s_multiple_beds.get_inst_map().find(instance->id())};
+                    //y21
                     if (
-                        it != s_multiple_beds.get_inst_map().end()
+                        (it != s_multiple_beds.get_inst_map().end()
                         && it->second == bed_index
                         && instance->printable
-                        && instance->print_volume_state == ModelInstancePVS_Partly_Outside
+                        && instance->print_volume_state == ModelInstancePVS_Partly_Outside) || (object->in_exclude)
                     ) {
                         s_print_statuses[bed_index] = PrintStatus::outside;
                         break;