diff --git a/lib/Slic3r/Geometry/Clipper.pm b/lib/Slic3r/Geometry/Clipper.pm
index 0c35c93d9..b7a7da772 100644
--- a/lib/Slic3r/Geometry/Clipper.pm
+++ b/lib/Slic3r/Geometry/Clipper.pm
@@ -5,7 +5,7 @@ use warnings;
 require Exporter;
 our @ISA = qw(Exporter);
 our @EXPORT_OK = qw(
-	offset offset2 
+	offset 
 	offset_ex offset2_ex
     diff_ex diff union_ex intersection_ex 
     JT_ROUND JT_MITER JT_SQUARE 
diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 7370881ea..0385f88b8 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -7,7 +7,7 @@ use List::Util qw(min max sum first);
 use Slic3r::Flow ':roles';
 use Slic3r::Geometry qw(scale epsilon);
 use Slic3r::Geometry::Clipper qw(diff diff_ex intersection intersection_ex union union_ex 
-    offset offset2 offset_ex offset2_ex JT_MITER);
+    offset offset_ex offset2_ex JT_MITER);
 use Slic3r::Print::State ':steps';
 use Slic3r::Surface ':types';
 
diff --git a/src/libslic3r/Geometry.cpp b/src/libslic3r/Geometry.cpp
index d5ef41125..e60eb01b6 100644
--- a/src/libslic3r/Geometry.cpp
+++ b/src/libslic3r/Geometry.cpp
@@ -1083,8 +1083,7 @@ MedialAxis::process_edge_neighbors(const VD::edge_type* edge, ThickPolyline* pol
     }
 }
 
-bool
-MedialAxis::validate_edge(const VD::edge_type* edge)
+bool MedialAxis::validate_edge(const VD::edge_type* edge)
 {
     // prevent overflows and detect almost-infinite edges
 #ifndef CLIPPERLIB_INT32
diff --git a/src/libslic3r/PNGReadWrite.cpp b/src/libslic3r/PNGReadWrite.cpp
index 3308f1fd4..51bf7de7c 100644
--- a/src/libslic3r/PNGReadWrite.cpp
+++ b/src/libslic3r/PNGReadWrite.cpp
@@ -103,6 +103,7 @@ bool decode_png(IStream &in_buf, ImageGreyscale &out_img)
 // Down to earth function to store a packed RGB image to file. Mostly useful for debugging purposes.
 // Based on https://www.lemoda.net/c/write-png/
 // png_color_type is PNG_COLOR_TYPE_RGB or PNG_COLOR_TYPE_GRAY
+//FIXME maybe better to use tdefl_write_image_to_png_file_in_memory() instead?
 static bool write_rgb_or_gray_to_file(const char *file_name_utf8, size_t width, size_t height, int png_color_type, const uint8_t *data)
 {
     bool         result       = false;
diff --git a/tests/libslic3r/test_elephant_foot_compensation.cpp b/tests/libslic3r/test_elephant_foot_compensation.cpp
index a1c23f4a9..09ad33f41 100644
--- a/tests/libslic3r/test_elephant_foot_compensation.cpp
+++ b/tests/libslic3r/test_elephant_foot_compensation.cpp
@@ -15,22 +15,6 @@ using namespace Slic3r;
 
 namespace Slic3r {
 	ClipperLib::Path mittered_offset_path_scaled(const Points& contour, const std::vector<float>& deltas, double miter_limit);
-
-#if 0
-	static Points mittered_offset_path_scaled_points(const Points& contour, const std::vector<float>& deltas, double miter_limit)
-	{
-		Points out;
-		ClipperLib::Path scaled = mittered_offset_path_scaled(contour, deltas, miter_limit);
-		for (ClipperLib::IntPoint& pt : scaled) {
-			pt.X += CLIPPER_OFFSET_SCALE_ROUNDING_DELTA;
-			pt.Y += CLIPPER_OFFSET_SCALE_ROUNDING_DELTA;
-			pt.X >>= CLIPPER_OFFSET_POWER_OF_2;
-			pt.Y >>= CLIPPER_OFFSET_POWER_OF_2;
-			out.emplace_back(coord_t(pt.x()), coord_t(pt.y()));
-		}
-		return out;
-	}
-#endif
 }
 
 static ExPolygon spirograph_gear_1mm()
diff --git a/xs/xsp/Clipper.xsp b/xs/xsp/Clipper.xsp
index 40ee6480b..bae6a103e 100644
--- a/xs/xsp/Clipper.xsp
+++ b/xs/xsp/Clipper.xsp
@@ -41,18 +41,6 @@ offset_ex(polygons, delta, joinType = Slic3r::ClipperLib::jtMiter, miterLimit =
     OUTPUT:
         RETVAL
 
-Polygons
-offset2(polygons, delta1, delta2, joinType = Slic3r::ClipperLib::jtMiter, miterLimit = 3)
-    Polygons                polygons
-    const float             delta1
-    const float             delta2
-    Slic3r::ClipperLib::JoinType    joinType
-    double                  miterLimit
-    CODE:
-        RETVAL = offset2(polygons, delta1, delta2, joinType, miterLimit);
-    OUTPUT:
-        RETVAL
-
 ExPolygons
 offset2_ex(polygons, delta1, delta2, joinType = Slic3r::ClipperLib::jtMiter, miterLimit = 3)
     Polygons                polygons