docs: Minor cleanup to square_tower.scad

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

docs/prints/square_tower.scad

@@ -8,12 +8,33 @@ square_size = 60;
 square_height = 50;
 antiwarp_height = .8;
 antiwarp_radius = 5;
+CUT = 0.01;
 
-module square_with_anti_warp() {
+module notch(x, y, rot) {
+    depth = .5;
+    width = 1;
+    translate([x, y, 0])
+        rotate([0, 0, rot])
+            translate([-depth, -width, -CUT])
+                cube([2*depth, 2*width, square_height + 2*CUT]);
+}
+
+module square_with_notches() {
+    difference() {
+        // Start with initial square
+        cube([square_size, square_size, square_height]);
+        // Remove four notches on inside perimeter
+        notch(square_width, square_size/2 - 4, 0);
+        notch(square_size - square_width, square_size/2, 0);
+        notch(square_size/2, square_width, 90);
+        notch(square_size/2, square_size - square_width, 90);
+    }
+}
+
+module anti_warp_feet() {
     module anti_warp_cylinder() {
         cylinder(r=antiwarp_radius, h=antiwarp_height, $fs=.5);
     }
-    cube([square_size, square_size, square_height]);
     dist = antiwarp_radius / 2.5;
     translate([dist, dist, 0])
         anti_warp_cylinder();
@@ -27,37 +48,14 @@ module square_with_anti_warp() {
 
 module hollow_square() {
     difference() {
-        square_with_anti_warp();
-        translate([square_width, square_width, -1])
+        union() {
+            square_with_notches();
+            anti_warp_feet();
+        }
+        translate([square_width, square_width, -CUT])
             cube([square_size-2*square_width, square_size-2*square_width,
-                  square_height+2]);
+                  square_height + 2*CUT]);
     }
 }
 
-module notch() {
-    CUT = 0.01;
-    depth = .5;
-    width = 1;
-    translate([-depth, -width, -CUT])
-        cube([2*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();
+hollow_square();