diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index fc83b1a8d97..eec10964c72 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -2894,9 +2894,12 @@ static void apply_to_print_region_config(PrintRegionConfig &out, const DynamicPr
     if (opt_extruder)
         if (int extruder = opt_extruder->value; extruder != 0) {
             // Not a default extruder.
-            out.sparse_infill_filament.value = extruder;
-            out.solid_infill_filament.value  = extruder;
-            out.wall_filament.value          = extruder;
+            if (out.sparse_infill_filament.value == 0) 
+                out.sparse_infill_filament.value = extruder;
+            if (out.solid_infill_filament.value == 0)
+                out.solid_infill_filament.value  = extruder;
+            if (out.wall_filament.value == 0)
+                out.wall_filament.value          = extruder;
         }
     // 2) Copy the rest of the values.
     for (auto it = in.cbegin(); it != in.cend(); ++ it)