From 5e1be197d4626fef02935437584d75476dec0c92 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Wed, 26 Apr 2017 13:43:54 +0800
Subject: [PATCH] supported r_delta and chamfer

---
 src/box_extrude.scad | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/box_extrude.scad b/src/box_extrude.scad
index 06ac65b7..277d7060 100644
--- a/src/box_extrude.scad
+++ b/src/box_extrude.scad
@@ -10,15 +10,20 @@
 *
 **/
 
-module box_extrude(height, shell_thickness) {
+module box_extrude(height, shell_thickness, offset_mode = "delta", chamfer = false) {
     linear_extrude(shell_thickness)
         children();
         
     linear_extrude(height) 
         difference() {
             children();
-            offset(delta = -shell_thickness) 
-                children();
+            if(offset_mode == "delta") {
+                offset(delta = -shell_thickness, chamfer = chamfer) 
+                    children(); 
+            } else {
+                offset(r = -shell_thickness) 
+                    children(); 
+            } 
         }    
 }