diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 6d0a076fde..00663a32d3 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -6460,6 +6460,9 @@ std::string GCode::retract(bool toolchange, bool is_last_retraction, LiftType li
 
 std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bool by_object)
 {
+    //init extrude
+    m_writer.init_extruder(new_filament_id);
+
     int new_extruder_id = get_extruder_id(new_filament_id);
     if (!m_writer.need_toolchange(new_filament_id))
         return "";
diff --git a/src/libslic3r/GCodeWriter.cpp b/src/libslic3r/GCodeWriter.cpp
index 32dc859403..04d546c98f 100644
--- a/src/libslic3r/GCodeWriter.cpp
+++ b/src/libslic3r/GCodeWriter.cpp
@@ -994,6 +994,15 @@ std::string GCodeWriter::set_extruder(unsigned int filament_id)
     return this->need_toolchange(filament_id) ? this->toolchange(filament_id) : "";
 }
 
+void GCodeWriter::init_extruder(unsigned int filament_id)
+{
+    if (m_curr_extruder_id == -1 && filament_id != -1) {
+        auto filament_extruder_iter = Slic3r::lower_bound_by_predicate(m_filament_extruders.begin(), m_filament_extruders.end(), [filament_id](const Extruder &e) { return e.id() < filament_id; });
+        assert(filament_extruder_iter != m_filament_extruders.end() && filament_extruder_iter->id() == filament_id);
+        m_curr_extruder_id = filament_extruder_iter->extruder_id();
+        m_curr_filament_extruder[m_curr_extruder_id] = &*filament_extruder_iter;
+    }
+}
 
 bool GCodeWriter::need_toolchange(unsigned int filament_id)const
 {
diff --git a/src/libslic3r/GCodeWriter.hpp b/src/libslic3r/GCodeWriter.hpp
index 0fa7fad4ee..720d89a4c1 100644
--- a/src/libslic3r/GCodeWriter.hpp
+++ b/src/libslic3r/GCodeWriter.hpp
@@ -64,6 +64,7 @@ public:
     // return false if this extruder was already selected
     bool        need_toolchange(unsigned int filament_id) const;
     std::string set_extruder(unsigned int filament_id);
+    void init_extruder(unsigned int filament_id);
     // Prefix of the toolchange G-code line, to be used by the CoolingBuffer to separate sections of the G-code
     // printed with the same extruder.
     std::string toolchange_prefix() const;