diff --git a/boxes/__init__.py b/boxes/__init__.py
index 60104c9..44385b3 100755
--- a/boxes/__init__.py
+++ b/boxes/__init__.py
@@ -118,6 +118,15 @@ class Boxes:
 
     def __init__(self):
         self.argparser = ArgumentParser(description=self.__doc__)
+        self.argparser.add_argument(
+            "--fingerjointfinger",  action="store", type=float, default=1.0,
+            help="width of the fingers in multiples of thickness")
+        self.argparser.add_argument(
+            "--fingerjointspace",  action="store", type=float, default=1.0,
+            help="width of the space between fingers in multiples of thickness")
+        self.argparser.add_argument(
+            "--fingerjointsurrounding",  action="store", type=float, default=1.0,
+            help="amount of space needed at the end in multiples of normal spaces")
         self.argparser.add_argument(
             "--thickness",  action="store", type=float, default=4.0,
             help="thickness of the material")
@@ -220,6 +229,10 @@ class Boxes:
 
         # Share settings object
         s = edges.FingerJointSettings(self.thickness)
+        s.setValues(self.thickness,
+                    finger=getattr(self, "fingerjointfinger", 1.0),
+                    space=getattr(self, "fingerjointspace", 1.0),
+                    surroundingspaces=getattr(self, "fingerjointsurrounding", 1.0))
         self.addPart(edges.FingerJointEdge(self, s))
         self.addPart(edges.FingerJointEdgeCounterPart(self, s))
         self.addPart(edges.FingerHoleEdge(self, s))
diff --git a/boxes/generators/box.py b/boxes/generators/box.py
index 722f3fd..37c227f 100755
--- a/boxes/generators/box.py
+++ b/boxes/generators/box.py
@@ -21,15 +21,16 @@ class Box(Boxes):
     def __init__(self):
         Boxes.__init__(self)
         self.buildArgParser("x", "y", "h")
+        self.argparser.set_defaults(
+            fingerjointfinger=3.0,
+            fingerjointspace=3.0
+            )
 
     def render(self):
         x, y, h = self.x, self.y, self.h
         t = self.thickness
         self.open(width=x+y+40, height=y+2*h+50)
 
-        self.edges["f"].settings.setValues(self.thickness, space=3, finger=3,
-                                        surroundingspaces=1)
-
         d2 = [edges.Bolts(2)]
         d3 = [edges.Bolts(3)]
 
diff --git a/boxes/generators/box2.py b/boxes/generators/box2.py
index e776a3a..7ffe192 100755
--- a/boxes/generators/box2.py
+++ b/boxes/generators/box2.py
@@ -23,13 +23,15 @@ class Box(Boxes):
     def __init__(self):
         Boxes.__init__(self)
         self.buildArgParser("x", "y", "h")
+        self.argparser.set_defaults(
+            fingerjointfinger=3.0,
+            fingerjointspace=3.0
+            )
 
     def render(self):
         x, y, h = self.x, self.y, self.h
         t = self.thickness
         self.open(width=x+y+40, height=y+2*h+50)
-        self.edges["f"].settings.setValues(self.thickness, space=3, finger=3,
-                                           surroundingspaces=1)
 
         d2 = [edges.Bolts(2)]
         d3 = [edges.Bolts(3)]
diff --git a/boxes/generators/box3.py b/boxes/generators/box3.py
index 04dda3a..906d181 100755
--- a/boxes/generators/box3.py
+++ b/boxes/generators/box3.py
@@ -21,6 +21,10 @@ class Box(Boxes):
     def __init__(self):
         Boxes.__init__(self)
         self.buildArgParser("x", "y", "h")
+        self.argparser.set_defaults(
+            fingerjointfinger=3.0,
+            fingerjointspace=3.0
+            )
 
     def render(self):
         x, y, h = self.x, self.y, self.h
@@ -28,9 +32,6 @@ class Box(Boxes):
 
         self.open(width=x+y+10*t, height=y+h+10*t)
 
-        self.edges["f"].settings.setValues(self.thickness, space=3, finger=3,
-                                           surroundingspaces=1)
-
         d2 = [edges.Bolts(2)]
         d3 = [edges.Bolts(3)]
 
diff --git a/boxes/generators/magazinefile.py b/boxes/generators/magazinefile.py
index 76125c9..dd2c319 100755
--- a/boxes/generators/magazinefile.py
+++ b/boxes/generators/magazinefile.py
@@ -21,6 +21,10 @@ class Box(Boxes):
     def __init__(self):
         Boxes.__init__(self)
         self.buildArgParser("x", "y", "h", "hi")
+        self.argparser.set_defaults(
+            fingerjointfinger=2.0,
+            fingerjointspace=2.0
+            )
 
     def side(self, w, h, hi):
         r = min(h-hi, w) / 2.0
@@ -62,8 +66,6 @@ class Box(Boxes):
 
         self.open(width=x+y+8*t, height=x+h+hi+4*t)
 
-        self.edges["f"].settings.setValues(self.thickness, space=2, finger=2)
-
         self.ctx.save()
         self.rectangularWall(x, h, "Ffef", move="up")
         self.rectangularWall(x, hi, "Ffef", move="up")
diff --git a/boxes/generators/typetray.py b/boxes/generators/typetray.py
index f5bfd9f..93c5f09 100755
--- a/boxes/generators/typetray.py
+++ b/boxes/generators/typetray.py
@@ -27,6 +27,11 @@ class TypeTray(Boxes):
         self.argparser.add_argument(
             "--gripwidth",  action="store", type=float, default=70,
             dest="gw", help="width of th grip hole in mm (zero for no hole)")
+        self.argparser.set_defaults(
+            fingerjointfinger=3.0,
+            fingerjointspace=3.0,
+            fingerjointsurrounding=0.5,
+            )
 
     def xSlots(self):
         posx = -0.5 * self.thickness
@@ -74,8 +79,6 @@ class TypeTray(Boxes):
         t = self.thickness
 
         self.open(width=2*max(x,y)+10*t, height=(len(self.sx)+len(self.sy))*(h+2*t)+4*t)
-        self.edges["f"].settings.setValues(self.thickness, space=3, finger=3,
-                                           surroundingspaces=0.5)
 
         self.moveTo(t, t)
         # outer walls