diff --git a/tests/png/printed_box.png b/tests/png/printed_box.png
index 0c16a02..24fd5d1 100644
Binary files a/tests/png/printed_box.png and b/tests/png/printed_box.png differ
diff --git a/vitamins/insert.scad b/vitamins/insert.scad
index 8391a94..492b67e 100644
--- a/vitamins/insert.scad
+++ b/vitamins/insert.scad
@@ -137,19 +137,26 @@ module insert_lug(insert, wall, counter_bore = 0, extension = 0, corner_r = 0, f
     boss_h = insert_hole_length(insert);
     boss_h2 = boss_h + counter_bore;
 
-    module shape()
-        intersection() {
+    module shape() {
+        module _shape()
             hull() {
                 circle(boss_r);
 
                 translate([boss_r + extension - eps, 0])
                     square([eps, 2 * boss_r], center = true);
             }
-            if(corner_r)
+
+        if(corner_r)
+            intersection() {
+                _shape();
+
                 translate([boss_r + extension - corner_r, 0])
                     rotate(-45)
                         quadrant(w = 100, r = corner_r - eps, center = true);
-        }
+            }
+        else
+            _shape();
+    }
 
     translate_z(-boss_h)
         linear_extrude(boss_h)
diff --git a/vitamins/jhead.scad b/vitamins/jhead.scad
index 66b4c2b..1f6b4e6 100644
--- a/vitamins/jhead.scad
+++ b/vitamins/jhead.scad
@@ -179,23 +179,27 @@ module jhead_hot_end_assembly(type, filament, naked = false) { //! Assembly with
     //
     // heater block
     //
-    rotate(90)
-        translate([-nozzle_x(heater), 0, inset - insulator_length - heater_height(heater) / 2]) {
-            intersection() {
-                group() {
-                    translate([resistor_x(heater), -exploded() * 15, 0])
-                        rotate([90, 0, 0])
-                             sleeved_resistor(resistor, PTFE20, bare = -10);
+    module heater_components() {
+        translate([resistor_x(heater), -exploded() * 15, 0])
+            rotate([90, 0, 0])
+                 sleeved_resistor(resistor, PTFE20, bare = -10);
+
+        translate([-heater_length(heater) / 2 + resistor_length(thermistor) / 2 - exploded() * 10, thermistor_y(heater), 0])
+            rotate([90, 0, -90])
+                 sleeved_resistor(thermistor, PTFE07, heatshrink = HSHRNK16);
+    }
+
+    rotate(90)
+        translate([-nozzle_x(heater), 0, inset - insulator_length - heater_height(heater) / 2])
+            if(exploded())
+                heater_components();
+            else
+                intersection() {
+                    heater_components();
 
-                    translate([-heater_length(heater) / 2 + resistor_length(thermistor) / 2 - exploded() * 10, thermistor_y(heater), 0])
-                        rotate([90, 0, -90])
-                             sleeved_resistor(thermistor, PTFE07, heatshrink = HSHRNK16);
-                }
-                if(!exploded())
                     if(naked)
                         color("grey") cylinder(r = 12, h = 100, center = true);
                     else
                         cube(1, true);             // hide the wires when not exploded
-            }
-    }
+                }
 }