Merge branch '2.7'

cura/Settings/GlobalStack.py

@@ -61,6 +61,12 @@ class GlobalStack(CuraContainerStack):
     #                                            already have the maximum number of extruders.
     def addExtruder(self, extruder: ContainerStack) -> None:
         extruder_count = self.getProperty("machine_extruder_count", "value")
+
+        if extruder_count <= 1:
+            Logger.log("i", "Not adding extruder[%s] to [%s] because it is a single-extrusion machine.",
+                       extruder.id, self.id)
+            return
+
         if extruder_count and len(self._extruders) + 1 > extruder_count:
             Logger.log("w", "Adding extruder {meta} to {id} but its extruder count is {count}".format(id = self.id, count = extruder_count, meta = str(extruder.getMetaData())))
             return
@@ -73,7 +79,9 @@ class GlobalStack(CuraContainerStack):
         if any(item.getId() == extruder.id for item in self._extruders.values()):
             Logger.log("w", "Extruder [%s] has already been added to this stack [%s]", extruder.id, self._id)
             return
+
         self._extruders[position] = extruder
+        Logger.log("i", "Extruder[%s] added to [%s] at position [%s]", extruder.id, self.id, position)
 
     ##  Overridden from ContainerStack
     #

plugins/3MFReader/ThreeMFWorkspaceReader.py

@@ -17,6 +17,7 @@ from .WorkspaceDialog import WorkspaceDialog
 
 import xml.etree.ElementTree as ET
 
+from cura.Settings.CuraStackBuilder import CuraStackBuilder
 from cura.Settings.ExtruderManager import ExtruderManager
 from cura.Settings.ExtruderStack import ExtruderStack
 from cura.Settings.GlobalStack import GlobalStack
@@ -665,6 +666,9 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                 Logger.log("e", "Resolve strategy of %s for machine is not supported",
                            self._resolve_strategies["machine"])
 
+            # Create a new definition_changes container if it was empty
+            if stack.definitionChanges == self._container_registry.getEmptyInstanceContainer():
+                stack.setDefinitionChanges(CuraStackBuilder.createDefinitionChangesContainer(stack, stack._id + "_settings"))
             global_stack = stack
             Job.yieldThread()
         except:
@@ -674,8 +678,18 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                 self._container_registry.removeContainer(container.getId())
             return
 
+        #
+        # Use the number of extruders from the global stack instead of the number of extruder stacks this project file
+        # contains. The Custom FDM Printer can have multiple extruders, but the actual number of extruders in used is
+        # defined in the global stack.
+        # Because for single-extrusion machines, there won't be an extruder stack, so relying on the the extruder count
+        # in the global stack can avoid problems in those cases.
+        #
+        extruder_count_from_global_stack = global_stack.getProperty("machine_extruder_count", "value")
+
         # --
         # load extruder stack files
+        if extruder_count_from_global_stack > 1:
             try:
                 for extruder_stack_file in extruder_stack_files:
                     container_id = self._stripFileToId(extruder_stack_file)
@@ -712,6 +726,10 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                     else:
                         Logger.log("w", "Unknown resolve strategy: %s", self._resolve_strategies["machine"])
 
+                    # Create a new definition_changes container if it was empty
+                    if stack.definitionChanges == self._container_registry.getEmptyInstanceContainer():
+                        stack.setDefinitionChanges(CuraStackBuilder.createDefinitionChangesContainer(stack, stack._id + "_settings"))
+
                     extruder_stacks.append(stack)
             except:
                 Logger.logException("w", "We failed to serialize the stack. Trying to clean up.")
@@ -823,9 +841,6 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
         if extruder_stacks:
             for stack in extruder_stacks:
                 ExtruderManager.getInstance().registerExtruder(stack, global_stack.getId())
-        else:
-            # Machine has no extruders, but it needs to be registered with the extruder manager.
-            ExtruderManager.getInstance().registerExtruder(None, global_stack.getId())
 
         Logger.log("d", "Workspace loading is notifying rest of the code of changes...")
 

plugins/3MFWriter/ThreeMFWorkspaceWriter.py

@@ -2,11 +2,9 @@ from UM.Workspace.WorkspaceWriter import WorkspaceWriter
 from UM.Application import Application
 from UM.Preferences import Preferences
 from UM.Settings.ContainerRegistry import ContainerRegistry
-from UM.Settings.ContainerStack import ContainerStack
 from cura.Settings.ExtruderManager import ExtruderManager
 import zipfile
 from io import StringIO
-import copy
 import configparser
 
 

plugins/SliceInfoPlugin/SliceInfo.py

@@ -76,6 +76,9 @@ class SliceInfo(Extension):
             data["active_machine"] = {"definition_id": global_container_stack.definition.getId(), "manufacturer": global_container_stack.definition.getMetaData().get("manufacturer","")}
 
             data["extruders"] = []
+            extruder_count = len(global_container_stack.extruders)
+            extruders = []
+            if extruder_count > 1:
                 extruders = list(ExtruderManager.getInstance().getMachineExtruders(global_container_stack.getId()))
                 extruders = sorted(extruders, key = lambda extruder: extruder.getMetaDataEntry("position"))