diff --git a/src/libslic3r/Fill/Fill.cpp b/src/libslic3r/Fill/Fill.cpp
index cc7ee79..660b6e6 100644
--- a/src/libslic3r/Fill/Fill.cpp
+++ b/src/libslic3r/Fill/Fill.cpp
@@ -549,11 +549,7 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
         params.anchor_length_max = surface_fill.params.anchor_length_max;
         params.resolution        = resolution;
 		//w14
-		//w20
-        if (perimeter_generator == PerimeterGeneratorType::Mix_wall)
-			params.use_arachne       = (perimeter_generator == PerimeterGeneratorType::Arachne && surface_fill.params.pattern == ipConcentricInternal) || surface_fill.params.pattern == ipEnsuring || surface_fill.params.pattern == ipConcentricInternal;
-        else
-			params.use_arachne       = (perimeter_generator == PerimeterGeneratorType::Arachne && surface_fill.params.pattern == ipConcentricInternal) || 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) {
@@ -565,25 +561,25 @@ void Layer::make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive:
 			try {
                 if (params.use_arachne) {
 					//w14
-                    /* if (surface_fill.params.pattern == ipConcentricInternal) {
+                    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;*/
+                        f->overlap = 0;
                     thick_polylines = f->fill_surface_arachne(&surface_fill.surface, params);
                 }
 				//w14
 				else {
-                    /* if (surface_fill.params.pattern == ipConcentricInternal) {
+                    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;*/
+                        f->overlap = 0;
                     polylines = f->fill_surface(&surface_fill.surface, params);
                 }
 			} catch (InfillFailedException &) {
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 3b5b44b..962ed0b 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -230,11 +230,9 @@ static const t_config_enum_values s_keys_map_ForwardCompatibilitySubstitutionRul
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(ForwardCompatibilitySubstitutionRule)
 
-//w20
 static t_config_enum_values s_keys_map_PerimeterGeneratorType {
     { "classic", int(PerimeterGeneratorType::Classic) },
-    { "arachne", int(PerimeterGeneratorType::Arachne) },
-    { "mix_wall", int(PerimeterGeneratorType::Mix_wall) }
+    { "arachne", int(PerimeterGeneratorType::Arachne) }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(PerimeterGeneratorType)
 
@@ -3533,7 +3531,6 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloat(0));
 
-    //w20
     def = this->add("perimeter_generator", coEnum);
     def->label = L("Perimeter generator");
     def->category = L("Layers and Perimeters");
@@ -3543,8 +3540,7 @@ void PrintConfigDef::init_fff_params()
                       "This setting also affects the Concentric infill.");
     def->set_enum<PerimeterGeneratorType>({
         { "classic", L("Classic") },
-        { "arachne", L("Arachne") },
-        { "mix_wall", L("Mix_wall")}
+        { "arachne", L("Arachne") }
     });
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionEnum<PerimeterGeneratorType>(PerimeterGeneratorType::Arachne));
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 4e30a60..e3af18e 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -133,15 +133,13 @@ enum DraftShield {
 enum class LabelObjectsStyle {
     Disabled, Octoprint, Firmware
 };
-//w20
 enum class PerimeterGeneratorType
 {
     // Classic perimeter generator using Clipper offsets with constant extrusion width.
     Classic,
     // Perimeter generator with variable extrusion width based on the paper
     // "A framework for adaptive width control of dense contour-parallel toolpaths in fused deposition modeling" ported from Cura.
-    Arachne,
-    Mix_wall
+    Arachne
 };
 //B3
 enum class GCodeThumbnailsFormat { QIDI,PNG, JPG, QOI };