1 files changed, 35 insertions, 6 deletions
diff --git a/docs/prints/square.scad b/docs/prints/square.scad
index c5f34d87..9416cf44 100644
--- a/docs/prints/square.scad
+++ b/docs/prints/square.scad
@@ -7,10 +7,39 @@ square_width = 5;
 square_size = 60;
 square_height = 5;
 
-difference() {
-  cube([square_size, square_size, square_height]);
-  translate([square_width, square_width, -1])
-    cube([square_size-2*square_width, square_size-2*square_width, square_height+2]);
-  translate([-.5, square_size/2 - 4, -1])
-    cube([1, 2, square_height+2]);
+module hollow_square() {
+    difference() {
+        cube([square_size, square_size, square_height]);
+        translate([square_width, square_width, -1])
+            cube([square_size-2*square_width, square_size-2*square_width,
+                  square_height+2]);
+    }
 }
+
+module notch() {
+    CUT = 0.01;
+    depth = .5;
+    width = 2;
+    translate([-depth, -width/2, -CUT])
+        cube([depth*2, width, square_height + 2*CUT]);
+}
+
+module square_with_notches() {
+    difference() {
+        // Start with initial square
+        hollow_square();
+        // Remove four notches on inside perimeter
+        translate([square_width, square_size/2 - 4, 0])
+            notch();
+        translate([square_size/2, square_size - square_width, 0])
+            rotate([0, 0, 90])
+                notch();
+        translate([square_size - square_width, square_size/2, 0])
+            notch();
+        translate([square_size/2, square_width, 0])
+            rotate([0, 0, 90])
+                notch();
+    }
+}
+
+square_with_notches();