From 0756b51eb2b457a1ddfddc0ab8e445c779737597 Mon Sep 17 00:00:00 2001
From: "xun.zhang" <xun.zhang@bambulab.com>
Date: Thu, 25 Jul 2024 20:59:10 +0800
Subject: [PATCH] FIX: wrong filament map in layer filament

1.Should calculate cost if filament used in that layer is 1,because
we should consider the last filament used in previous layer

jira:NONE

Signed-off-by: xun.zhang <xun.zhang@bambulab.com>
Change-Id: I5838af77f1d73bfa07c65bd6ee12ae352dc3b571
---
 src/libslic3r/GCode/ToolOrdering.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/libslic3r/GCode/ToolOrdering.cpp b/src/libslic3r/GCode/ToolOrdering.cpp
index 2ae1460e6..9835bcffe 100644
--- a/src/libslic3r/GCode/ToolOrdering.cpp
+++ b/src/libslic3r/GCode/ToolOrdering.cpp
@@ -192,11 +192,19 @@ std::vector<unsigned int> get_extruders_order(const std::vector<std::vector<floa
                                               bool use_forcast = false,
                                               float* cost = nullptr)
 {
-    if (curr_layer_extruders.size() <= 1) {
+    if (curr_layer_extruders.empty()) {
         if (cost)
             *cost = 0;
         return curr_layer_extruders;
     }
+    if (curr_layer_extruders.size() == 1) {
+        if (cost) {
+            *cost = 0;
+            if (start_extruder_id)
+                *cost = wipe_volumes[*start_extruder_id][curr_layer_extruders[0]];
+        }
+        return curr_layer_extruders;
+    }
 
     if (use_forcast)
         return solve_extruder_order_with_forcast(wipe_volumes, curr_layer_extruders, next_layer_extruders, start_extruder_id, cost);