diff --git a/src/libslic3r/Fill/Fill.cpp b/src/libslic3r/Fill/Fill.cpp
index 27ab032..b81f028 100644
--- a/src/libslic3r/Fill/Fill.cpp
+++ b/src/libslic3r/Fill/Fill.cpp
@@ -340,10 +340,10 @@ std::vector<SurfaceFill> group_fills(const Layer &layer)
                 continue;
             } else if (narrow_expolygons_index.size() == expolygons_size) {
                 // w11
-                surface_fills[i].params.pattern = ipConcentric;
+                surface_fills[i].params.pattern = ipConcentricInternal;
             } else {
                 params         = surface_fills[i].params;
-                params.pattern = ipConcentric;
+                params.pattern = ipConcentricInternal;
                 surface_fills.emplace_back(params);
                 surface_fills.back().region_id            = surface_fills[i].region_id;
                 surface_fills.back().surface.surface_type = stInternalSolid;
@@ -547,7 +547,7 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
         params.anchor_length     = surface_fill.params.anchor_length;
         params.anchor_length_max = surface_fill.params.anchor_length_max;
         params.resolution        = resolution;
-        params.use_arachne       = (perimeter_generator == PerimeterGeneratorType::Arachne && surface_fill.params.pattern == ipConcentric) || surface_fill.params.pattern == ipEnsuring;
+        params.use_arachne       = (perimeter_generator == PerimeterGeneratorType::Arachne && surface_fill.params.pattern == ipConcentricInternal) || surface_fill.params.pattern == ipEnsuring;
         params.layer_height      = layerm.layer()->height;
 
         for (ExPolygon &expoly : surface_fill.expolygons) {
@@ -559,13 +559,14 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
 			try {
                 if (params.use_arachne) {
 					//w14
-                    if (surface_fill.surface.surface_type == stInternalSolid) {
+                    if (surface_fill.params.pattern == ipConcentricInternal) {
                         layerm.region().config().infill_overlap.percent ?
                             f->overlap      = layerm.region().config().perimeter_extrusion_width * layerm.region().config().infill_overlap.value / 100 *(-1):
                             f->overlap = float(layerm.region().config().infill_overlap.value);
-                    }
+                        
+                    } else
+                        f->overlap = 0;
                     thick_polylines = f->fill_surface_arachne(&surface_fill.surface, params);
-                    f->overlap      = 0;
                 }
                 else
 				    polylines = f->fill_surface(&surface_fill.surface, params);
@@ -696,7 +697,8 @@ Polylines Layer::generate_sparse_infill_polylines_for_anchoring(FillAdaptive::Oc
         case ipGyroid:
         case ipHilbertCurve:
         case ipArchimedeanChords:
-        case ipOctagramSpiral: break;
+        case ipOctagramSpiral:
+        case ipConcentricInternal: break;
         }
 
         // Create the filler object.
diff --git a/src/libslic3r/Fill/FillBase.cpp b/src/libslic3r/Fill/FillBase.cpp
index f55420c..b51da28 100644
--- a/src/libslic3r/Fill/FillBase.cpp
+++ b/src/libslic3r/Fill/FillBase.cpp
@@ -52,6 +52,8 @@ Fill* Fill::new_from_type(const InfillPattern type)
     case ipSupportBase:         return new FillSupportBase();
     case ipLightning:           return new FillLightning::Filler();
     case ipEnsuring:            return new FillEnsuring();
+    //w14
+    case ipConcentricInternal: return new FillConcentric();
     default: throw Slic3r::InvalidArgument("unknown type");
     }
 }
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 90cc955..b198eee 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -116,7 +116,9 @@ static const t_config_enum_values s_keys_map_InfillPattern {
     { "octagramspiral",     ipOctagramSpiral },
     { "adaptivecubic",      ipAdaptiveCubic },
     { "supportcubic",       ipSupportCubic },
-    { "lightning",          ipLightning }
+    { "lightning",          ipLightning },
+        //w14
+    { "concentricInternal", ipConcentricInternal }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(InfillPattern)
 
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 4ddd4eb..28293a1 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -66,6 +66,8 @@ enum InfillPattern : int {
     ipLightning,
     ipEnsuring,
     ipCount,
+    //w14
+    ipConcentricInternal,
 };
 
 enum class IroningType {