diff --git a/Cura/gui/gcodeTextArea.py b/Cura/gui/gcodeTextArea.py
index 3c023325..68d05249 100644
--- a/Cura/gui/gcodeTextArea.py
+++ b/Cura/gui/gcodeTextArea.py
@@ -19,6 +19,8 @@ class GcodeTextArea(wx.stc.StyledTextCtrl):
 		self.IndicatorSetForeground(0, "#0000FF")
 		self.IndicatorSetStyle(1, wx.stc.STC_INDIC_SQUIGGLE)
 		self.IndicatorSetForeground(1, "#FF0000")
+		self.SetWrapMode(wx.stc.STC_WRAP_NONE)
+		self.SetScrollWidth(1000)
 		
 		#GCodes and MCodes as supported by Marlin
 		#GCode 21 is not really supported by Marlin, but we still do not report it as error as it's often used.
diff --git a/Cura/gui/projectPlanner.py b/Cura/gui/projectPlanner.py
index 5f77025e..b24721e5 100644
--- a/Cura/gui/projectPlanner.py
+++ b/Cura/gui/projectPlanner.py
@@ -25,9 +25,108 @@ from util import stl
 from util import sliceRun
 from util import gcodeInterpreter
 
-class Action():
+class Action(object):
 	pass
 
+class ProjectObject(stl.stlModel):
+	def __init__(self, filename):
+		super(ProjectObject, self).__init__()
+
+		self.load(filename)
+
+		self.filename = filename
+		self.scale = 1.0
+		self.rotate = 0.0
+		self.flipX = False
+		self.flipY = False
+		self.flipZ = False
+		self.swapXZ = False
+		self.swapYZ = False
+		self.extruder = 0
+		
+		self.modelDisplayList = None
+		self.modelDirty = False
+
+		self.origonalVertexes = list(self.vertexes)
+		for i in xrange(0, len(self.origonalVertexes)):
+			self.origonalVertexes[i] = self.origonalVertexes[i].copy()
+		self.getMinimumZ()
+		
+		self.centerX = -self.getMinimum().x + 5
+		self.centerY = -self.getMinimum().y + 5
+		
+		self.updateModelTransform()
+
+		self.centerX = -self.getMinimum().x + 5
+		self.centerY = -self.getMinimum().y + 5
+
+	def updateModelTransform(self):
+		rotate = self.rotate / 180.0 * math.pi
+		scaleX = 1.0
+		scaleY = 1.0
+		scaleZ = 1.0
+		if self.flipX:
+			scaleX = -scaleX
+		if self.flipY:
+			scaleY = -scaleY
+		if self.flipZ:
+			scaleZ = -scaleZ
+		swapXZ = self.swapXZ
+		swapYZ = self.swapYZ
+		mat00 = math.cos(rotate) * scaleX
+		mat01 =-math.sin(rotate) * scaleY
+		mat10 = math.sin(rotate) * scaleX
+		mat11 = math.cos(rotate) * scaleY
+		
+		for i in xrange(0, len(self.origonalVertexes)):
+			x = self.origonalVertexes[i].x
+			y = self.origonalVertexes[i].y
+			z = self.origonalVertexes[i].z
+			if swapXZ:
+				x, z = z, x
+			if swapYZ:
+				y, z = z, y
+			self.vertexes[i].x = x * mat00 + y * mat01
+			self.vertexes[i].y = x * mat10 + y * mat11
+			self.vertexes[i].z = z * scaleZ
+
+		for face in self.faces:
+			v1 = face.v[0]
+			v2 = face.v[1]
+			v3 = face.v[2]
+			face.normal = (v2 - v1).cross(v3 - v1)
+			face.normal.normalize()
+
+		minZ = self.getMinimumZ()
+		minV = self.getMinimum()
+		maxV = self.getMaximum()
+		for v in self.vertexes:
+			v.z -= minZ
+			v.x -= minV.x + (maxV.x - minV.x) / 2
+			v.y -= minV.y + (maxV.y - minV.y) / 2
+		self.getMinimumZ()
+		self.modelDirty = True
+	
+	def clone(self):
+		p = ProjectObject(self.filename)
+
+		p.centerX = self.centerX + 5
+		p.centerY = self.centerY + 5
+		
+		p.filename = self.filename
+		p.scale = self.scale
+		p.rotate = self.rotate
+		p.flipX = self.flipX
+		p.flipY = self.flipY
+		p.flipZ = self.flipZ
+		p.swapXZ = self.swapXZ
+		p.swapYZ = self.swapYZ
+		p.extruder = self.extruder
+		
+		p.updateModelTransform()
+		
+		return p
+
 class projectPlanner(wx.Frame):
 	"Main user interface window"
 	def __init__(self):
@@ -62,6 +161,14 @@ class projectPlanner(wx.Frame):
 		toolbarUtil.NormalButton(self.toolbar, self.OnQuit, 'exit.png', 'Close project planner')
 		
 		self.toolbar.Realize()
+
+		self.toolbar2 = toolbarUtil.Toolbar(self)
+		toolbarUtil.NormalButton(self.toolbar2, self.OnAddModel, 'object-add.png', 'Add model')
+		toolbarUtil.NormalButton(self.toolbar2, self.OnRemModel, 'object-remove.png', 'Remove model')
+		toolbarUtil.NormalButton(self.toolbar2, self.OnMoveUp, 'move-up.png', 'Move model up in print list')
+		toolbarUtil.NormalButton(self.toolbar2, self.OnMoveDown, 'move-down.png', 'Move model down in print list')
+		toolbarUtil.NormalButton(self.toolbar2, self.OnCopy, 'copy.png', 'Make a copy of the current selected object')
+		self.toolbar2.Realize()
 		
 		sizer = wx.GridBagSizer(2,2)
 		self.SetSizer(sizer)
@@ -72,7 +179,8 @@ class projectPlanner(wx.Frame):
 		self.sliceButton = wx.Button(self, -1, "Slice")
 		self.autoPlaceButton = wx.Button(self, -1, "Auto Place")
 		
-		sizer.Add(self.toolbar, (0,0), span=(1,3), flag=wx.EXPAND)
+		sizer.Add(self.toolbar, (0,0), span=(1,1), flag=wx.EXPAND)
+		sizer.Add(self.toolbar2, (0,1), span=(1,2), flag=wx.EXPAND)
 		sizer.Add(self.preview, (1,0), span=(4,1), flag=wx.EXPAND)
 		sizer.Add(self.listbox, (1,1), span=(1,2), flag=wx.EXPAND)
 		sizer.Add(self.addButton, (2,1), span=(1,1))
@@ -156,9 +264,7 @@ class projectPlanner(wx.Frame):
 			while cp.has_section('model_%d' % (i)):
 				section = 'model_%d' % (i)
 				
-				item = stl.stlModel()
-				item.filename = unicode(cp.get(section, 'filename'), "utf-8")
-				self.loadModelFile(item)
+				item = ProjectObject(unicode(cp.get(section, 'filename'), "utf-8"))
 				item.centerX = float(cp.get(section, 'centerX'))
 				item.centerY = float(cp.get(section, 'centerY'))
 				item.scale = float(cp.get(section, 'scale'))
@@ -170,6 +276,7 @@ class projectPlanner(wx.Frame):
 				item.swapYZ = cp.get(section, 'swapYZ') == 'True'
 				if cp.has_option(section, 'extruder'):
 					item.extuder = int(cp.get(section, 'extruder'))-1
+				item.updateModelTransform()
 				i += 1
 				
 				self.list.append(item)
@@ -177,6 +284,7 @@ class projectPlanner(wx.Frame):
 			
 			self.listbox.SetSelection(len(self.list)-1)
 			self.OnListSelect(None)
+			self.preview.Refresh()
 
 		dlg.Destroy()
 
@@ -209,32 +317,67 @@ class projectPlanner(wx.Frame):
 		dlg.SetWildcard("STL files (*.stl)|*.stl;*.STL")
 		if dlg.ShowModal() == wx.ID_OK:
 			for filename in dlg.GetPaths():
-				item = stl.stlModel()
-				item.filename=filename
+				item = ProjectObject(filename)
 				profile.putPreference('lastFile', item.filename)
-				if not(os.path.exists(item.filename)):
-					return
-				self.loadModelFile(item)
 				self.list.append(item)
-				self.listbox.AppendAndEnsureVisible(os.path.split(item.filename)[1])
-				self.listbox.SetSelection(len(self.list)-1)
-				self.OnListSelect(None)
+				self.selection = item
+				self._updateListbox()
+		self.preview.Refresh()
 		dlg.Destroy()
 	
 	def OnRemModel(self, e):
 		if self.selection == None:
 			return
 		self.list.remove(self.selection)
-		i = self.listbox.GetSelection()
-		self.listbox.Delete(i)
-		if len(self.list) > i:
-			self.listbox.SetSelection(i)
-		elif len(self.list) > 0:
-			self.listbox.SetSelection(len(self.list) - 1)
-		self.selection = None
-		self.OnListSelect(None)
+		self._updateListbox()
 		self.preview.Refresh()
 	
+	def OnMoveUp(self, e):
+		if self.selection == None:
+			return
+		i = self.listbox.GetSelection()
+		if i == 0:
+			return
+		self.list.remove(self.selection)
+		self.list.insert(i-1, self.selection)
+		self._updateListbox()
+		self.preview.Refresh()
+
+	def OnMoveDown(self, e):
+		if self.selection == None:
+			return
+		i = self.listbox.GetSelection()
+		if i == len(self.list) - 1:
+			return
+		self.list.remove(self.selection)
+		self.list.insert(i+1, self.selection)
+		self._updateListbox()
+		self.preview.Refresh()
+	
+	def OnCopy(self, e):
+		if self.selection == None:
+			return
+		
+		item = self.selection.clone()
+		self.list.append(item)
+		self.selection = item
+		
+		self._updateListbox()
+		self.preview.Refresh()
+	
+	def _updateListbox(self):
+		self.listbox.Clear()
+		for item in self.list:
+			self.listbox.AppendAndEnsureVisible(os.path.split(item.filename)[1])
+		if self.selection in self.list:
+			self.listbox.SetSelection(self.list.index(self.selection))
+		elif len(self.list) > 0:
+			self.selection = self.list[0]
+			self.listbox.SetSelection(0)
+		else:
+			self.selection = None
+			self.listbox.SetSelection(-1)
+
 	def OnAutoPlace(self, e):
 		bestAllowedSize = int(self.machineSize.y)
 		bestArea = self._doAutoPlace(bestAllowedSize)
@@ -333,32 +476,6 @@ class projectPlanner(wx.Frame):
 		pspw.Centre()
 		pspw.Show(True)
 	
-	def loadModelFile(self, item):
-		item.load(item.filename)
-		item.origonalVertexes = list(item.vertexes)
-		for i in xrange(0, len(item.origonalVertexes)):
-			item.origonalVertexes[i] = item.origonalVertexes[i].copy()
-		item.getMinimumZ()
-		
-		item.centerX = -item.getMinimum().x + 5
-		item.centerY = -item.getMinimum().y + 5
-		item.scale = 1.0
-		item.rotate = 0.0
-		item.flipX = False
-		item.flipY = False
-		item.flipZ = False
-		item.swapXZ = False
-		item.swapYZ = False
-		item.extruder = 0
-		
-		item.modelDisplayList = None
-		item.modelDirty = False
-		
-		self.updateModelTransform(item)
-
-		item.centerX = -item.getMinimum().x + 5
-		item.centerY = -item.getMinimum().y + 5
-
 	def OnScaleChange(self, e):
 		if self.selection == None:
 			return
@@ -372,7 +489,8 @@ class projectPlanner(wx.Frame):
 		if self.selection == None:
 			return
 		self.selection.rotate = float(self.rotateCtrl.GetValue())
-		self.updateModelTransform(self.selection)
+		self.selection.updateModelTransform()
+		self.preview.Refresh()
 
 	def OnExtruderChange(self, e):
 		if self.selection == None:
@@ -380,57 +498,6 @@ class projectPlanner(wx.Frame):
 		self.selection.extruder = int(self.extruderCtrl.GetValue()) - 1
 		self.preview.Refresh()
 
-	def updateModelTransform(self, item):
-		rotate = item.rotate / 180.0 * math.pi
-		scaleX = 1.0
-		scaleY = 1.0
-		scaleZ = 1.0
-		if item.flipX:
-			scaleX = -scaleX
-		if item.flipY:
-			scaleY = -scaleY
-		if item.flipZ:
-			scaleZ = -scaleZ
-		swapXZ = item.swapXZ
-		swapYZ = item.swapYZ
-		mat00 = math.cos(rotate) * scaleX
-		mat01 =-math.sin(rotate) * scaleY
-		mat10 = math.sin(rotate) * scaleX
-		mat11 = math.cos(rotate) * scaleY
-		
-		for i in xrange(0, len(item.origonalVertexes)):
-			x = item.origonalVertexes[i].x
-			y = item.origonalVertexes[i].y
-			z = item.origonalVertexes[i].z
-			if swapXZ:
-				x, z = z, x
-			if swapYZ:
-				y, z = z, y
-			item.vertexes[i].x = x * mat00 + y * mat01
-			item.vertexes[i].y = x * mat10 + y * mat11
-			item.vertexes[i].z = z * scaleZ
-
-		for face in item.faces:
-			v1 = face.v[0]
-			v2 = face.v[1]
-			v3 = face.v[2]
-			face.normal = (v2 - v1).cross(v3 - v1)
-			face.normal.normalize()
-
-		self.moveModel(item)
-	
-	def moveModel(self, item):
-		minZ = item.getMinimumZ()
-		min = item.getMinimum()
-		max = item.getMaximum()
-		for v in item.vertexes:
-			v.z -= minZ
-			v.x -= min.x + (max.x - min.x) / 2
-			v.y -= min.y + (max.y - min.y) / 2
-		item.getMinimumZ()
-		item.modelDirty = True
-		self.preview.Refresh()
-
 class PreviewGLCanvas(glcanvas.GLCanvas):
 	def __init__(self, parent):
 		attribList = (glcanvas.WX_GL_RGBA, glcanvas.WX_GL_DOUBLEBUFFER, glcanvas.WX_GL_DEPTH_SIZE, 24, glcanvas.WX_GL_STENCIL_SIZE, 8)
@@ -637,28 +704,6 @@ class ProjectSliceProgressWindow(wx.Frame):
 		self.startTime = time.time()
 		self.sliceStartTime = time.time()
 		
-		#How long does each step take compared to the others. This is used to make a better scaled progress bar, and guess time left.
-		# TODO: Duplicate with sliceProgressPanel, move to sliceRun.
-		self.sliceStepTimeFactor = {
-			'start': 3.3713991642,
-			'slice': 15.4984838963,
-			'preface': 5.17178297043,
-			'inset': 116.362634182,
-			'fill': 215.702672005,
-			'multiply': 21.9536788464,
-			'speed': 12.759510994,
-			'raft': 31.4580039978,
-			'skirt': 19.3436040878,
-			'skin': 1.0,
-			'joris': 1.0,
-			'comb': 23.7805759907,
-			'cool': 27.148763895,
-			'dimension': 90.4914340973
-		}
-		self.totalRunTimeFactor = 0
-		for v in self.sliceStepTimeFactor.itervalues():
-			self.totalRunTimeFactor += v
-		
 		self.sizer = wx.GridBagSizer(2, 2) 
 		self.statusText = wx.StaticText(self, -1, "Building: %s" % (resultFilename))
 		self.progressGauge = wx.Gauge(self, -1)
@@ -690,13 +735,13 @@ class ProjectSliceProgressWindow(wx.Frame):
 
 	def SetProgress(self, stepName, layer, maxLayer):
 		if self.prevStep != stepName:
-			self.totalDoneFactor += self.sliceStepTimeFactor[self.prevStep]
+			self.totalDoneFactor += sliceRun.sliceStepTimeFactor[self.prevStep]
 			newTime = time.time()
 			#print "#####" + str(newTime-self.startTime) + " " + self.prevStep + " -> " + stepName
 			self.startTime = newTime
 			self.prevStep = stepName
 		
-		progresValue = ((self.totalDoneFactor + self.sliceStepTimeFactor[stepName] * layer / maxLayer) / self.totalRunTimeFactor) * 10000
+		progresValue = ((self.totalDoneFactor + sliceRun.sliceStepTimeFactor[stepName] * layer / maxLayer) / sliceRun.totalRunTimeFactor) * 10000
 		self.progressGauge.SetValue(int(progresValue))
 		self.statusText.SetLabel(stepName + " [" + str(layer) + "/" + str(maxLayer) + "]")
 	
diff --git a/Cura/gui/sliceProgessPanel.py b/Cura/gui/sliceProgessPanel.py
index 4eed4712..9e49e5b3 100644
--- a/Cura/gui/sliceProgessPanel.py
+++ b/Cura/gui/sliceProgessPanel.py
@@ -15,27 +15,6 @@ class sliceProgessPanel(wx.Panel):
 		self.filelist = filelist
 		self.abort = False
 		
-		#How long does each step take compared to the others. This is used to make a better scaled progress bar, and guess time left.
-		self.sliceStepTimeFactor = {
-			'start': 3.3713991642,
-			'slice': 15.4984838963,
-			'preface': 5.17178297043,
-			'inset': 116.362634182,
-			'fill': 215.702672005,
-			'multiply': 21.9536788464,
-			'speed': 12.759510994,
-			'raft': 31.4580039978,
-			'skirt': 19.3436040878,
-			'skin': 1.0,
-			'joris': 1.0,
-			'comb': 23.7805759907,
-			'cool': 27.148763895,
-			'dimension': 90.4914340973
-		}
-		self.totalRunTimeFactor = 0
-		for v in self.sliceStepTimeFactor.itervalues():
-			self.totalRunTimeFactor += v
-
 		box = wx.StaticBox(self, -1, filelist[0])
 		self.sizer = wx.StaticBoxSizer(box, wx.HORIZONTAL)
 
@@ -125,13 +104,13 @@ class sliceProgessPanel(wx.Panel):
 	
 	def SetProgress(self, stepName, layer, maxLayer):
 		if self.prevStep != stepName:
-			self.totalDoneFactor += self.sliceStepTimeFactor[self.prevStep]
+			self.totalDoneFactor += sliceRun.sliceStepTimeFactor[self.prevStep]
 			newTime = time.time()
 			#print "#####" + str(newTime-self.startTime) + " " + self.prevStep + " -> " + stepName
 			self.startTime = newTime
 			self.prevStep = stepName
 		
-		progresValue = ((self.totalDoneFactor + self.sliceStepTimeFactor[stepName] * layer / maxLayer) / self.totalRunTimeFactor) * 10000
+		progresValue = ((self.totalDoneFactor + sliceRun.sliceStepTimeFactor[stepName] * layer / maxLayer) / sliceRun.totalRunTimeFactor) * 10000
 		self.progressGauge.SetValue(int(progresValue))
 		self.statusText.SetLabel(stepName + " [" + str(layer) + "/" + str(maxLayer) + "]")
 
diff --git a/Cura/gui/toolbarUtil.py b/Cura/gui/toolbarUtil.py
index eba0a0b0..1ec088ef 100644
--- a/Cura/gui/toolbarUtil.py
+++ b/Cura/gui/toolbarUtil.py
@@ -180,6 +180,7 @@ class NormalButton(buttons.GenBitmapButton):
 		super(NormalButton, self).__init__(parent, id, self.bitmap, size=size)
 
 		self.helpText = helpText
+		self.callback = callback
 
 		self.SetBezelWidth(1)
 		self.SetUseFocusIndicator(False)
@@ -187,10 +188,14 @@ class NormalButton(buttons.GenBitmapButton):
 		self.Bind(wx.EVT_ENTER_WINDOW, self.OnMouseEnter)
 		self.Bind(wx.EVT_LEAVE_WINDOW, self.OnMouseLeave)
 		
-		self.Bind(wx.EVT_BUTTON, callback)
+		self.Bind(wx.EVT_BUTTON, self.OnButton)
 		
 		parent.AddControl(self)
 
+	def OnButton(self, event):
+		self.GetParent().OnPopupHide(event)
+		self.callback(event)
+
 	def OnMouseEnter(self, event):
 		self.GetParent().OnPopupDisplay(event)
 		event.Skip()
diff --git a/Cura/gui/validators.py b/Cura/gui/validators.py
index b1da7783..f29e8d1e 100644
--- a/Cura/gui/validators.py
+++ b/Cura/gui/validators.py
@@ -11,7 +11,7 @@ SUCCESS = 0
 WARNING = 1
 ERROR   = 2
 
-class validFloat():
+class validFloat(object):
 	def __init__(self, setting, minValue = None, maxValue = None):
 		self.setting = setting
 		self.setting.validators.append(self)
@@ -29,7 +29,7 @@ class validFloat():
 		except (ValueError, SyntaxError):
 			return ERROR, '"' + str(self.setting.GetValue()) + '" is not a valid number or expression'
 
-class validInt():
+class validInt(object):
 	def __init__(self, setting, minValue = None, maxValue = None):
 		self.setting = setting
 		self.setting.validators.append(self)
@@ -47,7 +47,7 @@ class validInt():
 		except (ValueError, SyntaxError):
 			return ERROR, '"' + str(self.setting.GetValue()) + '" is not a valid whole number or expression'
 
-class warningAbove():
+class warningAbove(object):
 	def __init__(self, setting, minValueForWarning, warningMessage):
 		self.setting = setting
 		self.setting.validators.append(self)
@@ -68,7 +68,7 @@ class warningAbove():
 			#We already have an error by the int/float validator in this case.
 			return SUCCESS, ''
 
-class wallThicknessValidator():
+class wallThicknessValidator(object):
 	def __init__(self, setting):
 		self.setting = setting
 		self.setting.validators.append(self)
@@ -94,7 +94,7 @@ class wallThicknessValidator():
 			#We already have an error by the int/float validator in this case.
 			return SUCCESS, ''
 
-class printSpeedValidator():
+class printSpeedValidator(object):
 	def __init__(self, setting):
 		self.setting = setting
 		self.setting.validators.append(self)
diff --git a/Cura/images/copy.png b/Cura/images/copy.png
new file mode 100644
index 00000000..5cdeb5fc
Binary files /dev/null and b/Cura/images/copy.png differ
diff --git a/Cura/images/move-down.png b/Cura/images/move-down.png
new file mode 100644
index 00000000..5891219e
Binary files /dev/null and b/Cura/images/move-down.png differ
diff --git a/Cura/images/move-up.png b/Cura/images/move-up.png
new file mode 100644
index 00000000..b3d9cef9
Binary files /dev/null and b/Cura/images/move-up.png differ
diff --git a/Cura/images/object-add.png b/Cura/images/object-add.png
new file mode 100644
index 00000000..1b362dab
Binary files /dev/null and b/Cura/images/object-add.png differ
diff --git a/Cura/images/object-remove.png b/Cura/images/object-remove.png
new file mode 100644
index 00000000..064e523c
Binary files /dev/null and b/Cura/images/object-remove.png differ
diff --git a/Cura/util/gcodeInterpreter.py b/Cura/util/gcodeInterpreter.py
index 3af69bb4..5714972c 100644
--- a/Cura/util/gcodeInterpreter.py
+++ b/Cura/util/gcodeInterpreter.py
@@ -9,13 +9,13 @@ import os
 from util import util3d
 from util import profile
 
-class gcodePath():
+class gcodePath(object):
 	def __init__(self, newType, pathType, startPoint):
 		self.type = newType
 		self.pathType = pathType
 		self.list = [startPoint]
 
-class gcode():
+class gcode(object):
 	def __init__(self):
 		self.regMatch = {}
 		self.layerList = []
diff --git a/Cura/util/sliceRun.py b/Cura/util/sliceRun.py
index edc304d3..4bc302a0 100644
--- a/Cura/util/sliceRun.py
+++ b/Cura/util/sliceRun.py
@@ -5,6 +5,28 @@ import platform, os, subprocess, sys
 from cura_sf.skeinforge_application.skeinforge_utilities import skeinforge_craft
 from util import profile
 
+#How long does each step take compared to the others. This is used to make a better scaled progress bar, and guess time left.
+sliceStepTimeFactor = {
+	'start': 3.3713991642,
+	'slice': 15.4984838963,
+	'preface': 5.17178297043,
+	'inset': 116.362634182,
+	'fill': 215.702672005,
+	'multiply': 21.9536788464,
+	'speed': 12.759510994,
+	'raft': 31.4580039978,
+	'skirt': 19.3436040878,
+	'skin': 1.0,
+	'joris': 1.0,
+	'comb': 23.7805759907,
+	'cool': 27.148763895,
+	'dimension': 90.4914340973
+}
+
+totalRunTimeFactor = 0
+for v in sliceStepTimeFactor.itervalues():
+	totalRunTimeFactor += v
+
 def getPyPyExe():
 	"Return the path to the pypy executable if we can find it. Else return False"
 	if platform.system() == "Windows":
diff --git a/Cura/util/stl.py b/Cura/util/stl.py
index 9b1323a2..bf7558b4 100644
--- a/Cura/util/stl.py
+++ b/Cura/util/stl.py
@@ -9,11 +9,11 @@ import struct
 
 from util import util3d
 
-class stlFace():
+class stlFace(object):
 	def __init__(self, v0, v1, v2):
 		self.v = [v0, v1, v2]
 
-class stlModel():
+class stlModel(object):
 	def __init__(self):
 		self.faces = []
 		self.vertexes = []
diff --git a/Cura/util/util3d.py b/Cura/util/util3d.py
index 30b25159..d5411fc9 100644
--- a/Cura/util/util3d.py
+++ b/Cura/util/util3d.py
@@ -1,7 +1,7 @@
 
 import math
 
-class Vector3():
+class Vector3(object):
 	def __init__(self, x=0.0, y=0.0, z=0.0):
 		self.x = x
 		self.y = y