diff --git a/Matekiste_Laser_Stencil.scad b/Matekiste_Laser_Stencil.scad
index 676a27b..09beb66 100644
--- a/Matekiste_Laser_Stencil.scad
+++ b/Matekiste_Laser_Stencil.scad
@@ -25,21 +25,9 @@ module base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y) {
  * base_plane(...) with rounded edges, using helper function __radius_cutout(...)
  */
 module round_base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius) {
-    difference() {
+    intersection() {
         base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y);
-        
-        translate([width-radius, height-radius])
-        __radius_cutout(radius);
-        translate([radius, height-radius])
-        rotate([0, 0, 90])
-        __radius_cutout(radius);
-        translate([radius, radius])
-        rotate([0, 0, 180])
-        __radius_cutout(radius);
-        translate([width-radius, radius])
-        rotate([0, 0, 270])
-        __radius_cutout(radius);
-
+        __round_square(width, height, radius);
     }
 }
 
@@ -105,4 +93,24 @@ module __radius_cutout(radius) {
         square([radius, radius], center=true);
         circle(radius, $fn=RESOLUTION);
     }    
+}
+
+/*
+ * Helper function for square with round edges
+ */
+module __round_square(width, height, radius) {
+    difference() {
+        square([width, height]);
+        translate([width-radius, height-radius])
+        __radius_cutout(radius);
+        translate([radius, height-radius])
+        rotate([0, 0, 90])
+        __radius_cutout(radius);
+        translate([radius, radius])
+        rotate([0, 0, 180])
+        __radius_cutout(radius);
+        translate([width-radius, radius])
+        rotate([0, 0, 270])
+        __radius_cutout(radius);
+    }
 }
\ No newline at end of file