diff --git a/FlatCAMApp.py b/FlatCAMApp.py
index 28a69412..7c72897f 100644
--- a/FlatCAMApp.py
+++ b/FlatCAMApp.py
@@ -221,6 +221,7 @@ class App(QtCore.QObject):
             "excellon_travelz": self.defaults_form.excellon_group.travelz_entry,
             "excellon_feedrate": self.defaults_form.excellon_group.feedrate_entry,
             "excellon_spindlespeed": self.defaults_form.excellon_group.spindlespeed_entry,
+            "excellon_toolchangez": self.defaults_form.excellon_group.toolchangez_entry,
             "geometry_plot": self.defaults_form.geometry_group.plot_cb,
             "geometry_cutz": self.defaults_form.geometry_group.cutz_entry,
             "geometry_travelz": self.defaults_form.geometry_group.travelz_entry,
@@ -262,6 +263,7 @@ class App(QtCore.QObject):
             "excellon_travelz": 0.1,
             "excellon_feedrate": 3.0,
             "excellon_spindlespeed": None,
+            "excellon_toolchangez": 1.0,
             "geometry_plot": True,
             "geometry_cutz": -0.002,
             "geometry_travelz": 0.1,
@@ -346,6 +348,7 @@ class App(QtCore.QObject):
             "excellon_travelz": self.options_form.excellon_group.travelz_entry,
             "excellon_feedrate": self.options_form.excellon_group.feedrate_entry,
             "excellon_spindlespeed": self.options_form.excellon_group.spindlespeed_entry,
+            "excellon_toolchangez": self.options_form.excellon_group.toolchangez_entry,
             "geometry_plot": self.options_form.geometry_group.plot_cb,
             "geometry_cutz": self.options_form.geometry_group.cutz_entry,
             "geometry_travelz": self.options_form.geometry_group.travelz_entry,
@@ -386,6 +389,7 @@ class App(QtCore.QObject):
             "excellon_travelz": 0.1,
             "excellon_feedrate": 3.0,
             "excellon_spindlespeed": None,
+            "excellon_toolchangez": 1.0,
             "geometry_plot": True,
             "geometry_cutz": -0.002,
             "geometry_travelz": 0.1,
@@ -1146,7 +1150,7 @@ class App(QtCore.QObject):
         # Options to scale
         dimensions = ['gerber_isotooldia', 'gerber_cutoutmargin', 'gerber_cutoutgapsize',
                       'gerber_noncoppermargin', 'gerber_bboxmargin', 'excellon_drillz',
-                      'excellon_travelz', 'excellon_feedrate', 'cncjob_tooldia',
+                      'excellon_travelz', 'excellon_feedrate', 'excellon_toolchangez', 'cncjob_tooldia',
                       'geometry_cutz', 'geometry_travelz', 'geometry_feedrate',
                       'geometry_cnctooldia', 'geometry_painttooldia', 'geometry_paintoverlap',
                       'geometry_paintmargin']
diff --git a/FlatCAMGUI.py b/FlatCAMGUI.py
index 64cdac0f..8bb2445e 100644
--- a/FlatCAMGUI.py
+++ b/FlatCAMGUI.py
@@ -586,14 +586,22 @@ class ExcellonOptionsGroupUI(OptionsGroupUI):
         self.feedrate_entry = LengthEntry()
         grid1.addWidget(self.feedrate_entry, 2, 1)
 
+        toolchangezlabel = QtGui.QLabel('Toolchange Z:')
+        toolchangezlabel.setToolTip(
+            "Tool Z where user can change drill bit\n"
+        )
+        grid1.addWidget(toolchangezlabel, 3, 0)
+        self.toolchangez_entry = LengthEntry()
+        grid1.addWidget(self.toolchangez_entry, 3, 1)
+
         spdlabel = QtGui.QLabel('Spindle speed:')
         spdlabel.setToolTip(
             "Speed of the spindle\n"
             "in RPM (optional)"
         )
-        grid1.addWidget(spdlabel, 3, 0)
+        grid1.addWidget(spdlabel, 4, 0)
         self.spindlespeed_entry = IntEntry(allow_empty=True)
-        grid1.addWidget(self.spindlespeed_entry, 3, 1)
+        grid1.addWidget(self.spindlespeed_entry, 4, 1)
 
 
 class GeometryOptionsGroupUI(OptionsGroupUI):
diff --git a/camlib.py b/camlib.py
index 325d1205..7d756a12 100644
--- a/camlib.py
+++ b/camlib.py
@@ -55,8 +55,6 @@ from svgparse import *
 
 import logging
 
-import operator
-
 log = logging.getLogger('base2')
 log.setLevel(logging.DEBUG)
 # log.setLevel(logging.WARNING)
@@ -2711,16 +2709,16 @@ class CNCjob(Geometry):
 
         # Tools
         
-        #sort the tools list by the second item in tuple (here we have a dict with diameter of the tool)
-        #so we actually are sorting the tools by diameter
-        sorted_tools = sorted(exobj.tools.items(), key = operator.itemgetter(1))    
+        # sort the tools list by the second item in tuple (here we have a dict with diameter of the tool)
+        # so we actually are sorting the tools by diameter
+        sorted_tools = sorted(exobj.tools.items(), key = lambda x: x[1])
         if tools == "all":
-            tools = str([i[0] for i in sorted_tools])   #we get a string of ordered tools
+            tools = str([i[0] for i in sorted_tools])   # we get a string of ordered tools
             log.debug("Tools 'all' and sorted are: %s" % str(tools))
         else:
-            selected_tools = [x.strip() for x in tools.split(",")]  #we strip spaces and also separate the tools by ','
+            selected_tools = [x.strip() for x in tools.split(",")]  # we strip spaces and also separate the tools by ','
             selected_tools = filter(lambda i: i in selected_tools, selected_tools)
-            tools = [i for i,j in sorted_tools for k in selected_tools if i == k]   #create a sorted list of selected tools from the sorted_tools list
+            tools = [i for i,j in sorted_tools for k in selected_tools if i == k]   # create a sorted list of selected tools from the sorted_tools list
             log.debug("Tools selected and sorted are: %s" % str(tools)) 
 
         # Points (Group by tool)