diff --git a/boxes/generators/slatwalltypetray.py b/boxes/generators/slatwalltypetray.py
index e7a2b8c..e08dbeb 100644
--- a/boxes/generators/slatwalltypetray.py
+++ b/boxes/generators/slatwalltypetray.py
@@ -93,16 +93,13 @@ class SlatwallTypeTray(_TopEdge):
 
 
         # outer walls
-        t1, t2, t3, t4 = "eeee" #self.topEdges(self.top_edge)
-        self.closedtop = False # self.top_edge in "fF"
-
         # x sides
 
         self.ctx.save()
 
         # outer walls
-        self.rectangularWall(x, h, [b, "f", t1, "f"], callback=[self.xHoles],  move="up")
-        self.rectangularWall(x, h+bh, [b, "C", t3, "c"], callback=[self.mirrorX(self.xHoles, x), ], move="up")
+        self.rectangularWall(x, h, [b, "f", "e", "f"], callback=[self.xHoles],  move="up")
+        self.rectangularWall(x, h+bh, [b, "C", "e", "c"], callback=[self.mirrorX(self.xHoles, x), ], move="up")
 
         # floor
         if b != "e":
@@ -116,27 +113,21 @@ class SlatwallTypeTray(_TopEdge):
         for i in range(len(self.sy) - 1):
             e = [edges.SlottedEdge(self, self.sx, be), "f",
                  edges.SlottedEdge(self, self.sx[::-1], "e", slots=0.5 * hi), "f"]
-            if self.closedtop and sameh:
-                e = [edges.SlottedEdge(self, self.sx, be), "f",
-                     edges.SlottedEdge(self, self.sx[::-1], "f", slots=0.5 * hi), "f"]
 
             self.rectangularWall(x, hi, e, move="up")
 
         # y walls
 
         # outer walls
-        self.trapezoidSideWall(y, h, h+bh, [b, "B", t2, "h"], radius=self.radius, callback=[self.yHoles, ], move="up")
+        self.trapezoidSideWall(y, h, h+bh, [b, "B", "e", "h"], radius=self.radius, callback=[self.yHoles, ], move="up")
         self.moveTo(0, 8)
-        self.trapezoidSideWall(y, h+bh, h, [b, "h", t4, "b"], radius=self.radius, callback=[self.mirrorX(self.yHoles, y), ], move="up")
+        self.trapezoidSideWall(y, h+bh, h, [b, "h", "e", "b"], radius=self.radius, callback=[self.mirrorX(self.yHoles, y), ], move="up")
         self.moveTo(0, 8)
 
         # inner walls
         for i in range(len(self.sx) - 1):
             e = [edges.SlottedEdge(self, self.sy, be, slots=0.5 * hi),
                  "f", "e", "f"]
-            if self.closedtop and sameh:
-                e = [edges.SlottedEdge(self, self.sy, be, slots=0.5 * hi),"f",
-                     edges.SlottedEdge(self, self.sy[::-1], "f"), "f"]
             self.rectangularWall(y, hi, e, move="up")