diff --git a/src/Mod/CAM/Path/Base/Util.py b/src/Mod/CAM/Path/Base/Util.py
index e8bcbde5f9..33beb423e1 100644
--- a/src/Mod/CAM/Path/Base/Util.py
+++ b/src/Mod/CAM/Path/Base/Util.py
@@ -77,10 +77,10 @@ def getPropertyValueString(obj, prop):
 def setProperty(obj, prop, value):
     """setProperty(obj, prop, value) ... set the property value of obj's property defined by its canonical name."""
     o, attr, name = _getProperty(obj, prop)
-    if not attr is None and type(value) == str:
-        if type(attr) == int:
+    if attr is not None and isinstance(value, str):
+        if isinstance(attr, int):
             value = int(value, 0)
-        elif type(attr) == bool:
+        elif isinstance(attr, bool):
             value = value.lower() in ["true", "1", "yes", "ok"]
     if o and name:
         setattr(o, name, value)
@@ -99,6 +99,10 @@ def isValidBaseObject(obj):
     if hasattr(obj, "BitBody") and hasattr(obj, "ShapeName"):
         # ToolBit's are not valid base objects
         return False
+    if hasattr(obj, "ToolBitID"):
+        return False
+    if any(hasattr(ob, "ToolBitID") for ob in getattr(obj, "InListRecursive", [])):
+        return False
     if obj.TypeId in NotValidBaseTypeIds:
         Path.Log.debug("%s is blacklisted (%s)" % (obj.Label, obj.TypeId))
         return False
diff --git a/src/Mod/CAM/Path/Main/Gui/Job.py b/src/Mod/CAM/Path/Main/Gui/Job.py
index ea33864664..cc76aac621 100644
--- a/src/Mod/CAM/Path/Main/Gui/Job.py
+++ b/src/Mod/CAM/Path/Main/Gui/Job.py
@@ -677,6 +677,26 @@ class StockFromExistingEdit(StockEdit):
         if job.Stock in solids:
             # regardless, what stock is/was, it's not a valid choice
             solids.remove(job.Stock)
+        excludeIndexes = []
+        for index, model in enumerate(solids):
+            if [ob.Name for ob in model.InListRecursive if "Tools" in ob.Name]:
+                excludeIndexes.append(index)
+            elif hasattr(model, "PathResource"):
+                excludeIndexes.append(index)
+            elif model.InList and hasattr(model.InList[0], "ToolBitID"):
+                excludeIndexes.append(index)
+            elif hasattr(model, "ToolBitID"):
+                excludeIndexes.append(index)
+            elif model.TypeId == "App::DocumentObjectGroup":
+                excludeIndexes.append(index)
+            elif hasattr(model, "StockType"):
+                excludeIndexes.append(index)
+            elif not model.ViewObject.ShowInTree:
+                excludeIndexes.append(index)
+
+        for i in sorted(excludeIndexes, reverse=True):
+            del solids[i]
+
         return sorted(solids, key=lambda c: c.Label)
 
     def setFields(self, obj):
@@ -692,9 +712,9 @@ class StockFromExistingEdit(StockEdit):
             for i, solid in enumerate(self.candidates(obj)):
                 self.form.stockExisting.addItem(solid.Label, solid)
                 label = "{}-{}".format(self.StockLabelPrefix, solid.Label)
-
                 if label == stockName:
                     index = i
+
             self.form.stockExisting.setCurrentIndex(index if index != -1 else 0)
 
         if not self.IsStock(obj):
@@ -1415,7 +1435,7 @@ class TaskPanel:
 
     def isValidDatumSelection(self, sel):
         if sel.ShapeType in ["Vertex", "Edge", "Face"]:
-            if hasattr(sel, "Curve") and type(sel.Curve) not in [Part.Circle]:
+            if hasattr(sel, "Curve") and not isinstance(sel.Curve, Part.Circle):
                 return False
             return True
 
@@ -1424,7 +1444,7 @@ class TaskPanel:
 
     def isValidAxisSelection(self, sel):
         if sel.ShapeType in ["Vertex", "Edge", "Face"]:
-            if hasattr(sel, "Curve") and type(sel.Curve) in [Part.Circle]:
+            if hasattr(sel, "Curve") and isinstance(sel.Curve, Part.Circle):
                 return False
             if hasattr(sel, "Surface") and sel.Surface.curvature(0, 0, "Max") != 0:
                 return False
diff --git a/src/Mod/CAM/Path/Main/Gui/JobDlg.py b/src/Mod/CAM/Path/Main/Gui/JobDlg.py
index 439f934b0f..a53c96a107 100644
--- a/src/Mod/CAM/Path/Main/Gui/JobDlg.py
+++ b/src/Mod/CAM/Path/Main/Gui/JobDlg.py
@@ -152,9 +152,11 @@ class JobCreate:
 
         for base in self.candidates:
             if (
-                not base in jobResources
+                base not in jobResources
                 and not PathJob.isResourceClone(job, base, None)
                 and not hasattr(base, "StockType")
+                and base.ViewObject.ShowInTree
+                and base.TypeId != "App::DocumentObjectGroup"
             ):
                 item0 = QtGui.QStandardItem()
                 item1 = QtGui.QStandardItem()