From 2099242b4fbb5ef5837f27c8df080c78936174d6 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Thu, 1 Oct 2020 11:54:14 +0800
Subject: [PATCH] add drilled_cube

---
 examples/drilled_cube.scad | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 examples/drilled_cube.scad

diff --git a/examples/drilled_cube.scad b/examples/drilled_cube.scad
new file mode 100644
index 00000000..e2a2dc18
--- /dev/null
+++ b/examples/drilled_cube.scad
@@ -0,0 +1,53 @@
+width = 70;
+joint_h = 2;
+level = 4;
+reducing_scale = 0.575; // [0:0.707107]
+$fn = 8;
+
+echo(atan2(1, sqrt(2)));
+
+module drilled_cube(width, reducing_scale, joint_h, level) {
+    module drills(width, reducing_scale, joint_h, level) {
+        w = width * reducing_scale;
+        r = 1.41421 * w / 2;
+        if(level > 0) {
+            z_offset = w / 2 + joint_h;    
+            for(i = [0:3]) {
+                rotate([i * 90, 0, 0])
+                translate([0, 0, z_offset])
+                linear_extrude(width)
+                    circle(r);
+            }
+            
+            for(ay = [90, -90]) {
+                rotate([0, ay, 0])
+                translate([0, 0, z_offset])
+                linear_extrude(width)
+                    circle(r);
+            }  
+            
+            drills(z_offset * 2, reducing_scale, joint_h, level - 1);
+        }
+        else {
+            for(i = [0:3]) {
+                rotate([i * 90, 0, 0])
+                linear_extrude(width)
+                    circle(r);
+            }
+            
+            for(ay = [90, -90]) {
+                rotate([0, ay, 0])
+                linear_extrude(width)
+                    circle(r);
+            }      
+        }
+    }
+
+    difference() {
+        cube(width, center = true);
+        drills(width, reducing_scale, joint_h, level - 1);
+    }
+}
+
+
+drilled_cube(width, reducing_scale, joint_h, level);
\ No newline at end of file