From 01c6326ed0f032e49a5fc568604f778b3fa02718 Mon Sep 17 00:00:00 2001
From: "jiaxi.chen" <jiaxi.chen@bambulab.com>
Date: Fri, 7 Mar 2025 15:51:06 +0800
Subject: [PATCH] FIX: use support_interface_material between support_material

jira: STUDIO-10544
Change-Id: Id1bfda49bc5ac2bd6ecbad473d8ee063d3c0f030
(cherry picked from commit e7eb3bd388ddecdb7f9f78bf69cd378b77b231ef)
---
 src/libslic3r/GCode.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index be21314504..12d6181f4f 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -4352,6 +4352,15 @@ LayerResult GCode::process_layer(
                                 break;
                             }
                     }
+                    if (print.config().filament_is_support.get_at(dontcare_extruder)) {
+                        // The last extruder printed on the previous layer extrudes support filament.
+                        // Try to find a non-support extruder on the same layer.
+                        for (unsigned int extruder_id : layer_tools.extruders)
+                            if (!print.config().filament_is_support.get_at(extruder_id)) {
+                                dontcare_extruder = extruder_id;
+                                break;
+                            }
+                    }
                     if (support_dontcare)
                         support_extruder = dontcare_extruder;
                     if (interface_dontcare)