diff --git a/src/libseqarrange/src/seq_preprocess.cpp b/src/libseqarrange/src/seq_preprocess.cpp
index 1587646d6b..528ed9f0ca 100644
--- a/src/libseqarrange/src/seq_preprocess.cpp
+++ b/src/libseqarrange/src/seq_preprocess.cpp
@@ -135,10 +135,10 @@ const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_NOZZLE_LEVEL_MK4 =
 const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK4 =
 {
     {   /* fan - hand tailored */
-	{ -1000000, -21000000},	
+	{ -10000000, -21000000},	
 	{ 37000000, -21000000},
 	{ 37000000,  44000000},
-	{ -1000000,  44000000}
+	{ -10000000,  44000000}
 
 	/* fan - original from decimator
 	{  87952801,    3665480},	
@@ -148,14 +148,14 @@ const std::vector<Slic3r::Polygon> SEQ_UNREACHABLE_POLYGON_EXTRUDER_LEVEL_MK4 =
 	{ 107889619,    2905295},		
 	{ 102396166,   55454515},	
 	{ 101386126,   58737097},	
-	{  93053422,   62777197},	
-	{  87447788,   59999636},	
-	{  70782970,   28440457},	
+	{  93 053 422,   62777197},	
+	{  87 447 788,   59999636},	
+	{  70 782 970,   28440457},	
 
 	// nozzle
-	{ -29076068,  18872356},	
-	{ -29001876,  18872356},	
-	{ -29001876,  18952646},	
+	{ -29 076 068,  18 872 356},	
+	{ -29 001 876,  18 872 356},	
+	{ -29 001 876,  18 952 646},	
 	{ -29076068,  18952646},	
 
  */
@@ -956,6 +956,11 @@ std::vector<std::vector<Slic3r::Polygon> > simplify_UnreachableZonePolygons(cons
 		{
 		    if (check_PolygonConsumation(unreachable_polygons[i], unreachable_polygons[j]))
 		    {
+			#ifdef DEBUG
+			{
+			    printf("Consumed: %d vs %d\n", i, j);
+			}
+			#endif
 			consumed = true;
 			break;
 		    }
@@ -963,7 +968,7 @@ std::vector<std::vector<Slic3r::Polygon> > simplify_UnreachableZonePolygons(cons
 	    }
 	}
 	if (!consumed)
-	{
+	{	    
 	    simplified_unreachable_polygons.push_back(unreachable_polygons[i]);
 	}
     }
diff --git a/src/libseqarrange/src/seq_preprocess.hpp b/src/libseqarrange/src/seq_preprocess.hpp
index e4791d9047..0aacdcb616 100644
--- a/src/libseqarrange/src/seq_preprocess.hpp
+++ b/src/libseqarrange/src/seq_preprocess.hpp
@@ -193,12 +193,15 @@ void prepare_UnreachableZonePolygons(const SolverConfiguration
 				     const std::vector<std::vector<Slic3r::Polygon> > &extruder_box_level_polygons,
 				     std::vector<Slic3r::Polygon>                     &unreachable_polygons);    
 
-bool check_PolygonSize(const SolverConfiguration &solver_configuration, const Slic3r::Polygon &polygon);
-bool check_PolygonSize(const SolverConfiguration &solver_configuration, coord_t scale_factor, const Slic3r::Polygon &polygon);    
-        
-void simplify_ConvexUnreachablePolygons(const std::vector<std::vector<Slic3r::Polygon> > &unreachable_convex_polygons,
-					std::vector<Slic3r::Polygon>                     &simplified_unreachable_polygons);
+bool check_PolygonSizeFitToPlate(const SolverConfiguration &solver_configuration, const Slic3r::Polygon &polygon);
+bool check_PolygonSizeFitToPlate(const SolverConfiguration &solver_configuration, coord_t scale_factor, const Slic3r::Polygon &polygon);    
 
+    
+/*----------------------------------------------------------------*/
+
+bool check_PolygonConsumation(const std::vector<Slic3r::Polygon> &polygons, const std::vector<Slic3r::Polygon> &consumer_polygons);    
+std::vector<std::vector<Slic3r::Polygon> > simplify_UnreachableZonePolygons(const std::vector<std::vector<Slic3r::Polygon> > &unreachable_polygons);
+    
 void glue_LowObjects(std::vector<SolvableObject> &solvable_ojects);
 
 
@@ -206,6 +209,7 @@ void glue_LowObjects(std::vector<SolvableObject> &solvable_ojects);
 
 double calc_PolygonArea(const Slic3r::Polygon &polygon);
 
+double calc_PolygonUnreachableZoneArea(const std::vector<Slic3r::Polygon> &unreachable_polygons);    
 double calc_PolygonUnreachableZoneArea(const Slic3r::Polygon              &polygon,
 				       const std::vector<Slic3r::Polygon> &unreachable_polygons);
 
diff --git a/src/slic3r/GUI/ArrangeHelper.cpp b/src/slic3r/GUI/ArrangeHelper.cpp
index 9c1c71fdb7..e2f4cf96ff 100644
--- a/src/slic3r/GUI/ArrangeHelper.cpp
+++ b/src/slic3r/GUI/ArrangeHelper.cpp
@@ -25,8 +25,8 @@ static Sequential::PrinterGeometry get_printer_geometry() {
 
 	// Just hardcode MK4 geometry for now.
 	std::vector<ExtruderSlice> slices;
-	slices.push_back(ExtruderSlice{ 0,        CONVEX, { { {   -500000,    -500000 }, {   500000,    -500000 }, {   500000,    500000 }, {   -500000,    500000 } } } });
-	slices.push_back(ExtruderSlice{ 3000000,  CONVEX, { { {  -1000000,  -21000000 }, { 37000000,  -21000000 }, { 37000000,  44000000 },	{  -1000000,  44000000 } },
+	slices.push_back(ExtruderSlice{ 0,        CONVEX, { { {  -5000000,   -5000000 }, {  5000000,   -5000000 }, {  5000000,   5000000 }, {   -5000000,    5000000 } } } });
+	slices.push_back(ExtruderSlice{ 3000000,  CONVEX, { { { -10000000,  -21000000 }, { 37000000,  -21000000 }, { 37000000,  44000000 },	{  -10000000,  44000000 } },
 										                { { -40000000,  -45000000 }, { 38000000,  -45000000 }, { 38000000,  20000000 }, { -40000000,  20000000 } } } });
 	slices.push_back(ExtruderSlice{ 11000000, BOX,    { { {-350000000,   -23000000 }, {350000000,   -23000000 }, {350000000, -35000000 }, {-350000000, -35000000 } } } });
 	slices.push_back(ExtruderSlice{ 13000000, BOX,    { { { -12000000, -350000000 }, {  9000000, -350000000 }, {  9000000, -39000000 }, { -12000000, -39000000 } },