diff --git a/boxes/generators/typetray.py b/boxes/generators/typetray.py
index 46a4854..eec20d8 100644
--- a/boxes/generators/typetray.py
+++ b/boxes/generators/typetray.py
@@ -24,7 +24,7 @@ class TypeTray(Boxes):
 
     def __init__(self):
         Boxes.__init__(self)
-        self.buildArgParser("sx", "sy", "h", "hi", "outside")
+        self.buildArgParser("sx", "sy", "h", "hi", "outside", "bottom_edge")
         self.addSettingsArgs(edges.FingerJointSettings, surroundingspaces=0.5)
         self.argparser.add_argument(
             "--closedtop", action="store", type=boolarg, default=False,
@@ -92,11 +92,12 @@ class TypeTray(Boxes):
         self.open()
 
         # outer walls
-        e1 = "Ffef"
-        e2 = "FFeF"
+        b = self.bottom_edge
+        e1 = b + "fef"
+        e2 = b + "FeF"
         if self.closedtop:
-            e1 = "FfFf"
-            e2 = "FFFF"
+            e1 = b + "fFf"
+            e2 = b + "FFF"
 
         self.rectangularWall(x, h, e1, callback=[self.xHoles, None, self.gripHole],  move="right")
         self.rectangularWall(y, h, e2, callback=[self.yHoles, ], move="up")