1 files changed, 21 insertions, 6 deletions
diff --git a/lampenhalter.scad b/lampenhalter.scad
index d63d705..735ce48 100644
--- a/lampenhalter.scad
+++ b/lampenhalter.scad
@@ -10,6 +10,8 @@ ad = 2;
 
 cr = 2;
 
+support_fraction = 0.5;
+
 module round_corner(r, h) {
   translate([-r, -r, 0])
   difference() {
@@ -18,15 +20,28 @@ module round_corner(r, h) {
   }
 }
 
+module side() {
+  w2 = (w-wi)/2;
+  s = support_fraction * (w2 - d);
+  translate([0, t, 0])
+    rotate([90, 0, 0])
+      linear_extrude(height = t, convexity=2)
+        polygon([[0,0], [0,h], [w2,h], [w2,h-d], [d,h-d-s], [d,0]]);
+}
+
 difference() {
   union() {
-    cube([w,t,h]);
-  };
-  union() {
-    // rail negative
-    translate([d, d, d]) cube([w-2*d,t,h-2*d]);
-    translate([(w-wi)/2, d, h-d]) cube([wi, t, d]);
+    // base plate
+    cube([w, t, d]);
 
+    // back
+    cube([w, d, h]);
+
+    // sides and top
+    side();
+    translate([w, 0, 0]) mirror() side();
+  }
+  union() {
     // retainer hole
     translate([(w-aw)/2, t-at-ad, 0]) cube([aw, at, 2*d]);