Hollowing step in SLAPrint process, PrintConfig params added.

src/libslic3r/PrintConfig.cpp

@@ -2830,6 +2830,22 @@ void PrintConfigDef::init_sla_params()
     def->min = 0;
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionFloat(0.3));
+    
+    def = this->add("hollowing_enable", coBool);
+    def->label = L("Enable hollowing");
+    def->category = L("Hollowing");
+    def->tooltip = L("Hollow out a model to have an empty interior");
+    def->mode = comSimple;
+    def->set_default_value(new ConfigOptionBool(false));
+    
+    def = this->add("hollowing_min_thickness", coFloat);
+    def->label = L("Hollowing thickness");
+    def->category = L("Hollowing");
+    def->tooltip  = L("Minimum wall thickness of a hollowed model.");
+    def->sidetext = L("mm");
+    def->min = 1;
+    def->mode = comSimple;
+    def->set_default_value(new ConfigOptionFloat(4));
 }
 
 void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &value)