From a6e3d6357667d4fe642fb5fc60581a30b1ca3734 Mon Sep 17 00:00:00 2001
From: "zhimin.zeng" <zhimin.zeng@bambulab.com>
Date: Wed, 21 Dec 2022 17:37:56 +0800
Subject: [PATCH] FIX: a part with new color change to negative part

even though there is only one color, the wipe tower is still exist

Change-Id: I5c68a4ca7239cfc74aba452a6588d74f6d622f47
(cherry picked from commit 032c2e6718c65aa4c5b18eecd0ccce27f3f489bb)
---
 src/libslic3r/Model.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index 5bc04b53f..9d49f4344 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -2352,6 +2352,12 @@ bool ModelVolume::is_splittable() const
 // BBS
 std::vector<int> ModelVolume::get_extruders() const
 {
+    if (m_type == ModelVolumeType::INVALID
+        || m_type == ModelVolumeType::NEGATIVE_VOLUME
+        || m_type == ModelVolumeType::SUPPORT_BLOCKER
+        || m_type == ModelVolumeType::SUPPORT_ENFORCER)
+        return std::vector<int>();
+
     if (mmu_segmentation_facets.timestamp() != mmuseg_ts) {
         std::vector<indexed_triangle_set> its_per_type;
         mmuseg_extruders.clear();