diff --git a/box.py b/box.py
index e4392e8..6547da2 100755
--- a/box.py
+++ b/box.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/box2.py b/box2.py
index bc804de..9b91f80 100755
--- a/box2.py
+++ b/box2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/box3.py b/box3.py
index 6285f68..36166ac 100755
--- a/box3.py
+++ b/box3.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/boxes.py b/boxes.py
index 6de428b..39483f5 100755
--- a/boxes.py
+++ b/boxes.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
@@ -567,13 +567,13 @@ class Boxes:
             f.seek(pos)
             f.write("mm")
         else:
-            print "Could not replace pt with mm"
+            print("Could not replace pt with mm")
         pos = s.find('pt"', pos+3)
         if pos > 0:
             f.seek(pos)
             f.write("mm")
         else:
-            print "Could not replace pt with mm"
+            print("Could not replace pt with mm")
 
     ############################################################
     ### Turtle graphics commands
diff --git a/castle.py b/castle.py
index 2c9e96f..e2a0b4e 100755
--- a/castle.py
+++ b/castle.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/drillbox.py b/drillbox.py
index e25dd03..ce23dcb 100755
--- a/drillbox.py
+++ b/drillbox.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/flexbox.py b/flexbox.py
index d22a80b..9767aef 100755
--- a/flexbox.py
+++ b/flexbox.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/flexbox2.py b/flexbox2.py
index 8fd929d..1966f76 100755
--- a/flexbox2.py
+++ b/flexbox2.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/flexbox3.py b/flexbox3.py
index 23c8e76..5975cbf 100755
--- a/flexbox3.py
+++ b/flexbox3.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/flextest.py b/flextest.py
index 1f585d7..8747a55 100755
--- a/flextest.py
+++ b/flextest.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
@@ -22,7 +22,7 @@ class FlexTest(Boxes):
     def render(self, x, y):
         self.moveTo(5, 5)
         self.edge(10)
-        self.flex(x, y)
+        self.flexEdge(x, y)
         self.edge(10)
         self.corner(90)
         self.edge(y)
diff --git a/folder.py b/folder.py
index c3d1e84..fe78367 100755
--- a/folder.py
+++ b/folder.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/lamp.py b/lamp.py
index 03582f2..6ea08ad 100755
--- a/lamp.py
+++ b/lamp.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/magazinefile.py b/magazinefile.py
index bb02fe7..0b4ace2 100755
--- a/magazinefile.py
+++ b/magazinefile.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/printer.py b/printer.py
index 6770c0a..495f2a8 100755
--- a/printer.py
+++ b/printer.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/silverwarebox.py b/silverwarebox.py
index 28bb50f..895e102 100755
--- a/silverwarebox.py
+++ b/silverwarebox.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/trayinsert.py b/trayinsert.py
index 83e3b1c..0c4b134 100755
--- a/trayinsert.py
+++ b/trayinsert.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify
diff --git a/typetray.py b/typetray.py
index 6360d1d..63394ea 100755
--- a/typetray.py
+++ b/typetray.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # Copyright (C) 2013-2014 Florian Festi
 #
 #   This program is free software: you can redistribute it and/or modify