From bdde20b433d2f43d41837fe73ff2588a27a5c92f Mon Sep 17 00:00:00 2001
From: Enrico Turri <enricoturri@seznam.cz>
Date: Tue, 5 Feb 2019 15:56:06 +0100
Subject: [PATCH] Fix of #1745

---
 src/libslic3r/Model.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index 0dbf9dd15..422717279 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -1445,7 +1445,7 @@ int ModelVolume::extruder_id() const
     int extruder_id = -1;
     if (this->is_model_part()) {
         const ConfigOption *opt = this->config.option("extruder");
-        if (opt == nullptr)
+        if ((opt == nullptr) || (opt->getInt() == 0))
             opt = this->object->config.option("extruder");
         extruder_id = (opt == nullptr) ? 0 : opt->getInt();
     }