diff --git a/tray/common.scad b/tray/common.scad
index f2d4a02..71331d8 100644
--- a/tray/common.scad
+++ b/tray/common.scad
@@ -4,7 +4,7 @@ include <../pi/orangepi.scad>
 tray_size      = [102, 61.5, 5];
 cutout_marings = [12, 12, -0.5];
 pillar_size    = [5, 6.3/2];
-brim_size      = [3, tray_size[1], pillar_size[0]];     
+brim_size      = [3, tray_size[1]-(2.5*2), pillar_size[0]];     
 screw_radius   = 3/2;
 
 module tray() {
@@ -19,7 +19,7 @@ module tray() {
             }
 
             // brim
-            translate([tray_size[0]-brim_size[0], 0, tray_size[2]]) cube(brim_size);
+            translate([tray_size[0]-brim_size[0], 2.5, tray_size[2]]) cube(brim_size);
         }
         // remove edges
         color("#ff0000") translate([-0.5, 0, tray_size[2]/2]) union() {
@@ -35,12 +35,6 @@ module tray() {
                 }
             }
         }
-
-        // remove edges of brim
-        translate([0, 0, tray_size[2]]) union() {
-                                                cube([tray_size[0]+1, 2.8, 10]);
-            translate([0, tray_size[1]-2.7, 0]) cube([tray_size[0]+1, 2.8, 10]);
-        }
     }
 }