diff --git a/scad/config.scad b/scad/config.scad
index 45eb825..31741fa 100644
--- a/scad/config.scad
+++ b/scad/config.scad
@@ -46,12 +46,16 @@ sheet_thickness = 16;                    // raw sheet thickness
 pockets_depth   = 6;                     // pockets depth
 pockets_color   = "RoyalBlue";           // pockets color
 connector_size  = [20, sheet_thickness]; // pockets/fingers [width, height]
+cutter_size     = 3.175/2;               // size of the smallest cutter you are using 1/4" R = 3.175
+dogbone         = false;                 // cut dogbones?
+
 
 // ---------------------------------------------------------------- //
 // shortcuts
 // ---------------------------------------------------------------- //
 m3_screw_radius = 1.5;
 m4_screw_radius = 2;
+dogbone_offset = sqrt(cutter_size*cutter_size/2);
 
 // ---------------------------------------------------------------- //
 // horizontal plate
diff --git a/scad/parts/feet.scad b/scad/parts/feet.scad
index d9d1c62..5d01d1c 100644
--- a/scad/parts/feet.scad
+++ b/scad/parts/feet.scad
@@ -12,17 +12,34 @@ use     <../shapes.scad>
 
 // feet
 module feet_2D() {
-    render() difference() {
-        rounded_square(feet_width, feet_height, corner_radius = [0, 0, feet_corners[3], feet_corners[0]]);
-        translate([foot_width, 0, 0])
-            y_mount(feet_width - (foot_width * 2), feet_gap_height, [feet_corners[1], feet_corners[2], feet_corners[3], feet_corners[0]]);
-    }
-    translate([feet_connectors_margin[3], feet_height, 0])
-        square(connector_size);
-    translate([(horizontal_plate_width - connector_size[0]) / 2, feet_height, 0])
-        square(connector_size);
-    translate([horizontal_plate_width - connector_size[0] - feet_connectors_margin[1], feet_height, 0])
-        square(connector_size);
+    render() difference(){ union() {
+			difference() {
+				rounded_square(feet_width, feet_height, corner_radius = [0, 0, feet_corners[3], feet_corners[0]]);
+				translate([foot_width, 0, 0])
+					y_mount(feet_width - (foot_width * 2), feet_gap_height, [feet_corners[1], feet_corners[2], feet_corners[3], feet_corners[0]]);
+			}
+			translate([feet_connectors_margin[3], feet_height, 0])
+				square(connector_size);
+			translate([(horizontal_plate_width - connector_size[0]) / 2, feet_height, 0])
+				square(connector_size);
+			translate([horizontal_plate_width - connector_size[0] - feet_connectors_margin[1], feet_height, 0])
+				square(connector_size);
+			}
+		if(dogbone==true){
+			translate([feet_connectors_margin[3], feet_height, 0]){
+				translate([connector_size[0] + dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+				translate([- dogbone_offset,+dogbone_offset,0]) circle(r=cutter_size);
+				}
+			translate([(horizontal_plate_width - connector_size[0]) / 2, feet_height, 0]){
+				translate([connector_size[0] + dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+				translate([- dogbone_offset,+dogbone_offset,0]) circle(r=cutter_size);
+				}
+			translate([horizontal_plate_width - connector_size[0] - feet_connectors_margin[1], feet_height, 0]){
+				translate([connector_size[0] + dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+				translate([- dogbone_offset,+dogbone_offset,0]) circle(r=cutter_size);
+				}
+			}
+		}
 }
 
 module feet_3D() {
diff --git a/scad/parts/horizontal_plate.scad b/scad/parts/horizontal_plate.scad
index 146ef40..13d58e2 100644
--- a/scad/parts/horizontal_plate.scad
+++ b/scad/parts/horizontal_plate.scad
@@ -59,12 +59,35 @@ module horizontal_base_plate() {
 // feet holes
 module _feet_connectors_holes() {
     // feet connector holes
-    translate([feet_connectors_margin[3], 0, 0])
-        square(feet_connectors_size);
-    translate([(horizontal_plate_width - feet_connectors_size[0]) / 2, 0, 0])
-        square(feet_connectors_size);
-    translate([horizontal_plate_width - feet_connectors_size[0] - feet_connectors_margin[1], 0, 0])
-        square(feet_connectors_size);
+    translate([feet_connectors_margin[3], 0, 0]){
+	    square(feet_connectors_size);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([feet_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,feet_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([feet_connectors_size[0] - dogbone_offset,feet_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
+	}
+    
+    translate([(horizontal_plate_width - feet_connectors_size[0]) / 2, 0, 0]){
+		square(feet_connectors_size);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([feet_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,feet_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([feet_connectors_size[0] - dogbone_offset,feet_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
+	}
+        
+    translate([horizontal_plate_width - feet_connectors_size[0] - feet_connectors_margin[1], 0, 0]){
+		square(feet_connectors_size);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([feet_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,feet_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([feet_connectors_size[0] - dogbone_offset,feet_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
+	}
     // feet screws holes
     center        = horizontal_plate_width / 2;
     half_pocket   = feet_connectors_size[0] / 2;
@@ -101,20 +124,43 @@ module triangle_connectors_holes() {
     margin_top = horizontal_plate_height - triangle_connectors_size[1] - triangle_connectors_margin[0];
     translate([triangle_connectors_margin[3], margin_top, 0]) {
         square(triangle_connectors_size);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
         triangle_screws_holes();
     }
     translate([horizontal_plate_width - triangle_connectors_size[0] - triangle_connectors_margin[1], margin_top, 0]) {
         square(triangle_connectors_size);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
         triangle_screws_holes();
     }
 }
 
 // vertical plate connectors holes
 module vertical_plate_holes() {
-    translate([0, vertical_plate_y_position, 0])
-        square([foot_width, sheet_thickness]);
-    translate([horizontal_plate_width - foot_width, vertical_plate_y_position, 0])
-        square([foot_width, sheet_thickness]);
+    translate([0, vertical_plate_y_position, 0]){
+		square([foot_width, sheet_thickness]);
+		if(dogbone==true){
+			translate([foot_width - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([foot_width - dogbone_offset,sheet_thickness - dogbone_offset,0]) circle(r=cutter_size);
+			}
+	}
+        
+    translate([horizontal_plate_width - foot_width, vertical_plate_y_position, 0]){
+		square([foot_width, sheet_thickness]);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,sheet_thickness - dogbone_offset,0]) circle(r=cutter_size);
+			}
+	}
 }
 
 // motor mount & z rod pockets
diff --git a/scad/parts/triangle.scad b/scad/parts/triangle.scad
index f2fa1ce..064b709 100644
--- a/scad/parts/triangle.scad
+++ b/scad/parts/triangle.scad
@@ -22,6 +22,24 @@ module triangle_connectors() {
         square([triangle_connectors_size[1], triangle_connectors_size[0]]);
 }
 
+module triangle_connectors_dogbone(){
+	translate([-triangle_connectors_size[0], 20, 0]){
+		translate([triangle_connectors_size[0] - dogbone_offset,-dogbone_offset,0]) circle(r=cutter_size);
+		translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1]+dogbone_offset,0]) circle(r=cutter_size);
+	}
+	translate([-triangle_connectors_size[0], (_triangle_height - 20 + triangle_connectors_size[1]) / 2, 0]){
+		translate([triangle_connectors_size[0] - dogbone_offset,-dogbone_offset,0]) circle(r=cutter_size);
+		translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1]+dogbone_offset,0]) circle(r=cutter_size);
+	}
+    translate([-triangle_connectors_size[0], _triangle_height - triangle_connectors_size[1], 0]){
+		translate([triangle_connectors_size[0] - dogbone_offset,-dogbone_offset,0]) circle(r=cutter_size);
+	}
+    translate([_triangle_width - triangle_connectors_size[1] - triangle_connectors_margin[0], -triangle_connectors_size[0], 0]){
+		translate([- dogbone_offset,triangle_connectors_size[0]-dogbone_offset,0]) circle(r=cutter_size);
+		translate([triangle_connectors_size[1] + dogbone_offset,triangle_connectors_size[0]-dogbone_offset,0]) circle(r=cutter_size);
+	}
+}
+
 // rear triangle
 module triangle_base(width, height, angle) {
     render() difference() {
@@ -48,12 +66,19 @@ module triangle_corner(){
 module triangle_2D() {
     translate([triangle_connectors_size[0], triangle_connectors_size[0], 0]) {
         render() difference() {
-            triangle_base(_triangle_width, _triangle_height, _triangle_angle);
-            translate([triangle_radius, _triangle_height / 2, 0])
-                square([_triangle_width, _triangle_height / 2]);
-        }
-        triangle_corner();
-        triangle_connectors();
+			union() { 
+				difference() {
+					triangle_base(_triangle_width, _triangle_height, _triangle_angle);
+					translate([triangle_radius, _triangle_height / 2, 0])
+						square([_triangle_width, _triangle_height / 2]);
+					}
+				triangle_corner();
+				triangle_connectors();
+				}
+			if(dogbone==true){
+				triangle_connectors_dogbone();
+				}
+			}
     }
 }
 
diff --git a/scad/parts/vertical_plate.scad b/scad/parts/vertical_plate.scad
index bf34332..73fae4d 100644
--- a/scad/parts/vertical_plate.scad
+++ b/scad/parts/vertical_plate.scad
@@ -69,12 +69,35 @@ module z_rod_holder_holes() {
 
 // triangle pockets
 module _triangle_connectors_holes() {
-    translate([-triangle_connectors_size[0], 20, 0])
-        square([triangle_connectors_size[0], triangle_connectors_size[1]]);
-    translate([-triangle_connectors_size[0], (_triangle_height - 20 + triangle_connectors_size[1]) / 2, 0])
-        square([triangle_connectors_size[0], triangle_connectors_size[1]]);
-    translate([-triangle_connectors_size[0], _triangle_height - triangle_connectors_size[1], 0])
+    translate([-triangle_connectors_size[0], 20, 0]){
         square([triangle_connectors_size[0], triangle_connectors_size[1]]);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
+		}
+    translate([-triangle_connectors_size[0], (_triangle_height - 20 + triangle_connectors_size[1]) / 2, 0]){
+		square([triangle_connectors_size[0], triangle_connectors_size[1]]);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
+		}
+        
+    translate([-triangle_connectors_size[0], _triangle_height - triangle_connectors_size[1], 0]){
+		square([triangle_connectors_size[0], triangle_connectors_size[1]]);
+		if(dogbone==true){
+			translate([dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,dogbone_offset,0]) circle(r=cutter_size);
+			translate([dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			translate([triangle_connectors_size[0] - dogbone_offset,triangle_connectors_size[1] - dogbone_offset,0]) circle(r=cutter_size);
+			}
+		}
+        
 }
 
 module triangle_connectors_holes() {