diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index 727a620d4..87c918d79 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -2044,10 +2044,9 @@ bool PartPlate::check_outside(int obj_id, int instance_id, BoundingBoxf3* boundi
 
 	BoundingBoxf3 instance_box = bounding_box? *bounding_box: object->instance_convex_hull_bounding_box(instance_id);
 	Polygon hull = instance->convex_hull_2d();
-	Vec3d up_point(m_origin.x() + m_width + Slic3r::BuildVolume::SceneEpsilon, m_origin.y() + m_depth + Slic3r::BuildVolume::SceneEpsilon, m_origin.z() + m_height + Slic3r::BuildVolume::SceneEpsilon);
-	Vec3d low_point(m_origin.x() - Slic3r::BuildVolume::SceneEpsilon, m_origin.y() - Slic3r::BuildVolume::SceneEpsilon, m_origin.z() - Slic3r::BuildVolume::SceneEpsilon);
-    if (instance_box.max.z() > low_point.z()) low_point.z() +=  instance_box.min.z(); // not considering outsize if sinking
-	BoundingBoxf3 plate_box(low_point, up_point);
+	BoundingBoxf3 plate_box = get_plate_box();
+	if (instance_box.max.z() > plate_box.min.z())
+		plate_box.min.z() += instance_box.min.z(); // not considering outsize if sinking
 
 	if (plate_box.contains(instance_box))
 	{
@@ -2089,11 +2088,7 @@ bool PartPlate::intersect_instance(int obj_id, int instance_id, BoundingBoxf3* b
 		ModelObject* object = m_model->objects[obj_id];
 		ModelInstance* instance = object->instances[instance_id];
 		BoundingBoxf3 instance_box = bounding_box? *bounding_box: object->instance_convex_hull_bounding_box(instance_id);
-		Vec3d up_point(m_origin.x() + m_width, m_origin.y() + m_depth, m_origin.z() + m_height);
-		Vec3d low_point(m_origin.x(), m_origin.y(), m_origin.z() - 5.0f);
-		BoundingBoxf3 plate_box(low_point, up_point);
-
-		result = plate_box.intersects(instance_box);
+		result = get_plate_box().intersects(instance_box);
 	}
 	else
 	{
@@ -2572,7 +2567,7 @@ void PartPlate::generate_exclude_polygon(ExPolygon &exclude_polygon)
 bool PartPlate::set_shape(const Pointfs& shape, const Pointfs& exclude_areas, Vec2d position, float height_to_lid, float height_to_rod)
 {
 	Pointfs new_shape, new_exclude_areas;
-
+	m_raw_shape = shape;
 	for (const Vec2d& p : shape) {
 		new_shape.push_back(Vec2d(p.x() + position.x(), p.y() + position.y()));
 	}
diff --git a/src/slic3r/GUI/PartPlate.hpp b/src/slic3r/GUI/PartPlate.hpp
index ab5d6bf6c..0f437bae7 100644
--- a/src/slic3r/GUI/PartPlate.hpp
+++ b/src/slic3r/GUI/PartPlate.hpp
@@ -115,6 +115,7 @@ private:
 
     friend class PartPlateList;
 
+    Pointfs m_raw_shape;
     Pointfs m_shape;
     Pointfs m_exclude_area;
     BoundingBoxf3 m_bounding_box;
@@ -370,10 +371,18 @@ public:
     void set_hover_id(int id) { m_hover_id = id; }
     const BoundingBoxf3& get_bounding_box(bool extended = false) { return extended ? m_extended_bounding_box : m_bounding_box; }
     const BoundingBox get_bounding_box_crd();
+    BoundingBoxf3 get_plate_box() {return get_build_volume();}
     BoundingBoxf3 get_build_volume()
     {
-        Vec3d up_point(m_origin.x() + m_width, m_origin.y() + m_depth, m_origin.z() + m_height);
-        Vec3d low_point(m_origin.x(), m_origin.y(), m_origin.z());
+        auto  eps=Slic3r::BuildVolume::SceneEpsilon;
+        Vec3d up_point = Vec3d(m_origin.x() + m_width + eps, m_origin.y() + m_depth + eps, m_origin.z() + m_height + eps);
+        Vec3d low_point  = Vec3d(m_origin.x() - eps, m_origin.y() - eps, m_origin.z() - eps);
+        if (m_raw_shape.size() > 0) {
+            up_point.x() += m_raw_shape[0].x();
+            up_point.y() += m_raw_shape[0].y();
+            low_point.x() += m_raw_shape[0].x();
+            low_point.y() += m_raw_shape[0].y();
+        }
         BoundingBoxf3 plate_box(low_point, up_point);
         return plate_box;
     }