diff --git a/test_box.png b/test_box.png
new file mode 100644
index 0000000..52d7513
Binary files /dev/null and b/test_box.png differ
diff --git a/test_box.scad b/test_box.scad
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--- /dev/null
+++ b/test_box.scad
@@ -0,0 +1,21 @@
+$fn=60;
+
+include <BOSL2/std.scad>
+
+box_width=150;
+box_length=100;
+box_height=60;
+e=3;
+rd=1.5;
+
+module box() {
+    rect_tube(size=[box_width, box_length], wall=3, h=box_height, rounding=1.5, anchor=BOT);
+    cuboid([box_width, box_length, e], rounding=rd);
+}
+
+difference() {
+    box();
+    translate([0,box_length/2-e/2,box_height*3/4]) cuboid([box_width/3, e*2, box_height/2+e/2], rounding=-box_width/10, edges=[TOP], except=[FRONT,BACK]);
+translate([0,box_length/2-e/2,box_height/4+e]) cuboid([box_width/3, e*2, box_height/2], rounding=box_width/10, edges=[BOT], except=[FRONT,BACK]);
+}
+