diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..74a8f70
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+exe:
+	pyinstaller main.py --onefile --name ASMBL-dev
\ No newline at end of file
diff --git a/src/ASMBL_parser.py b/src/ASMBL_parser.py
index 7c94b6f..e45e138 100644
--- a/src/ASMBL_parser.py
+++ b/src/ASMBL_parser.py
@@ -219,41 +219,31 @@ def split_cam_operations(self, gcode_sub):
 
     def assign_cam_layer_height(self, cam_layer, later_cam_layers, layer_overlap):
         """ Calculate the additive layer height that should be printed to before the CAM layer happens """
-        if len(later_cam_layers) > 0:
-            next_cam_layer_height = min([layer.cutting_height for layer in later_cam_layers])
-            later_additive = [layer for layer in self.gcode_add_layers[:-1]
-                              if layer.layer_height > next_cam_layer_height]
+        later_planar_layers = [layer for layer in later_cam_layers if layer.planar]
 
-            if layer_overlap == 0:
-                cam_layer.layer_height = next_cam_layer_height
-
-            elif len(later_additive) == 0:
-                cam_layer.layer_height = next_cam_layer_height
-
-            elif len(later_additive) >= layer_overlap:
-                cam_layer.layer_height = later_additive[layer_overlap - 1].layer_height
-
-            else:
-                cam_layer.layer_height = later_additive[-1].layer_height
+        if (not cam_layer.planar) or (len(later_planar_layers) == 0):
+            cutting_height = cam_layer.cutting_height
+        else:
+            cutting_height = min([layer.cutting_height for layer in later_planar_layers])
 
-        else:  # no later ops
-            later_additive = [layer for layer in self.gcode_add_layers[:-1]
-                              if layer.layer_height > cam_layer.cutting_height]
+        later_additive = [layer for layer in self.gcode_add_layers[:-1]
+                          if layer.layer_height > cutting_height]
 
-            if len(later_additive) == 0:   # no further printing
-                # add 10 since it is unlikely that the printed layer height will exceed 10 mm
-                # but still want to place cutting after a print at the same height
-                cam_layer.layer_height = cam_layer.cutting_height + 10
+        if (layer_overlap == 0) or (len(later_additive) == 0):
+            cam_layer_height = cutting_height
 
-            elif len(later_additive) >= layer_overlap:
-                cam_layer.layer_height = later_additive[layer_overlap - 1].layer_height
+        elif len(later_additive) >= layer_overlap:
+            cam_layer_height = later_additive[layer_overlap - 1].layer_height
 
-            else:
-                cam_layer.layer_height = later_additive[-1].layer_height
+        else:
+            cam_layer_height = later_additive[-1].layer_height
 
-        if cam_layer.layer_height == inf:
+        if cam_layer_height == inf:
             raise ValueError("CAM op height can't be 'inf'")
 
+        cam_layer.layer_height = cam_layer_height
+        return
+
     def order_cam_operations_by_layer(self, operations):
         """ Takes a list of cam operations and calculates the layer that they should be executed """
         unordered_cam_layers = []
diff --git a/src/fusion_api/Handlers.py b/src/fusion_api/Handlers.py
index d381f72..ec2fad0 100644
--- a/src/fusion_api/Handlers.py
+++ b/src/fusion_api/Handlers.py
@@ -4,6 +4,8 @@
 import traceback
 import time
 import os
+import sys
+import subprocess
 
 from ..ASMBL_parser import Parser
 
@@ -391,10 +393,11 @@ def notify(self, args):
             outputFolder = os.path.expanduser('~/Asmbl/output/')
             asmbl_parser.create_output_file(asmbl_parser.merged_gcode_script, outputFolder)
 
-            if (os.name == 'posix'):
-                os.system('open "%s"' % outputFolder)
-            elif (os.name == 'nt'):
+            if sys.platform == 'win32':
                 os.startfile(outputFolder)
+            else:
+                opener = 'open' if sys.platform == 'darwin' else 'xdg-open'
+                subprocess.call([opener, outputFolder])
         except:
             ui.messageBox('Failed combing gcode files:\n{}'.format(traceback.format_exc()))
             return
@@ -484,9 +487,10 @@ def notify(self, args):
             ui.messageBox('Failed posting toolpaths:\n{}'.format(traceback.format_exc()))
             return
 
-        if (os.name == 'posix'):
-            os.system('open "%s"' % output_folder)
-        elif (os.name == 'nt'):
+        if sys.platform == 'win32':
             os.startfile(output_folder)
+        else:
+            opener = 'open' if sys.platform == 'darwin' else 'xdg-open'
+            subprocess.call([opener, output_folder])
 
         ui.messageBox('Milling Setup Post Processing Complete.\nFile saved in \'{}\''.format(output_folder))
diff --git a/src/operations.py b/src/operations.py
deleted file mode 100644
index 8b128a1..0000000
--- a/src/operations.py
+++ /dev/null
@@ -1,12 +0,0 @@
-class Operations:
-    category = {
-        'planar': [
-            'adaptive2d',
-            'contour2d',
-            'contour_new'
-        ],
-        'non_planar': [
-            'parallel_new',
-            'radial_new',
-        ]
-    }