Added a config option to not print sparse layers on the wipe tower

src/libslic3r/PrintConfig.cpp

@@ -1825,6 +1825,14 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionBool(true));
 
+    def = this->add("wipe_tower_no_sparse_layers", coBool);
+    def->label = L("No sparse layers");
+    def->tooltip = L("If enabled, the wipe tower will not be printed on layers with no toolchanges. "
+                     "On layers with a toolchange, extruder will travel downward to print the wipe tower. "
+                     "User is responsible for ensuring there is no collision with the print.");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
     def = this->add("support_material", coBool);
     def->label = L("Generate support material");
     def->category = L("Support material");