add slow_down_layers

src/libslic3r/PrintConfig.cpp

@@ -1482,6 +1482,16 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloatOrPercent(30, false));
 
+    //w25
+    def           = this->add("slow_down_layers", coInt);
+    def->label    = L("Number of slow layers");
+    def->tooltip  = L("The first few layers are printed slower than normal. "
+                     "The speed is gradually increased in a linear fashion over the specified number of layers.");
+    def->category = L("Speed");
+    def->min      = 0;
+    def->mode     = comAdvanced;
+    def->set_default_value(new ConfigOptionInt(0));
+
     def = this->add("first_layer_temperature", coInts);
     def->label = L("First layer");
     def->full_label = L("First layer nozzle temperature");