From c91eb30de9499e9e6cf813da66d5f65d7116f54b Mon Sep 17 00:00:00 2001
From: Lipu Fei <lipu.fei815@gmail.com>
Date: Tue, 9 Jan 2018 13:24:38 +0100
Subject: [PATCH] Skip loaded instance containers

When trying to apply the fix for single extrusion machines by creating a
new ExtruderStack, skip the quality changes container that has already
been loaded.
---
 cura/Settings/CuraContainerRegistry.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cura/Settings/CuraContainerRegistry.py b/cura/Settings/CuraContainerRegistry.py
index 9a64f1421e..873876c30d 100644
--- a/cura/Settings/CuraContainerRegistry.py
+++ b/cura/Settings/CuraContainerRegistry.py
@@ -589,6 +589,9 @@ class CuraContainerRegistry(ContainerRegistry):
             if parser["general"]["name"] == name:
                 # load the container
                 container_id = os.path.basename(file_path).replace(".inst.cfg", "")
+                if self.findInstanceContainers(id = container_id):
+                    # this container is already in the registry, skip it
+                    continue
 
                 instance_container = InstanceContainer(container_id)
                 with open(file_path, "r") as f: