diff --git a/fan_guard.scad b/fan_guard.scad
index 7fc10fc..348d8a2 100644
--- a/fan_guard.scad
+++ b/fan_guard.scad
@@ -48,7 +48,7 @@ module fan_guard(type, name = false, thickness = fan_guard_thickness(), spokes =
     spoke_start = grill && rings > 1 ? inner_ring + ring_pitch : inner_ring;
     rounding = grill ? 1.5 : 0;
 
-    extrude_if(thickness) {
+    extrude_if(thickness, center = false) {
         difference() {
             offset(-rounding) offset(rounding) {
                 difference() {
diff --git a/gallery/IOT_50V_PSU.png b/gallery/IOT_50V_PSU.png
index 9cc1fcf..23b2740 100644
Binary files a/gallery/IOT_50V_PSU.png and b/gallery/IOT_50V_PSU.png differ
diff --git a/gallery/Laser_load.png b/gallery/Laser_load.png
index 1278f15..55450fe 100644
Binary files a/gallery/Laser_load.png and b/gallery/Laser_load.png differ
diff --git a/tests/fan_guard.scad b/tests/fan_guard.scad
index 4ac5c8b..a47f7bb 100644
--- a/tests/fan_guard.scad
+++ b/tests/fan_guard.scad
@@ -24,6 +24,6 @@ include <../vitamins/fans.scad>
 
 module fan_guards()
     layout([for(f = fans) fan_width(f)], 10)
-        color(pp1_colour) fan_guard(fans[$i], spokes = fan_width(fans[$i]) > 40 ? 8 : 4);
+        color(pp1_colour) fan_guard(fans[$i], spokes = fan_width(fans[$i]) > 60 ? 8 : 4);
 
 fan_guards();
diff --git a/tests/png/fan_guard.png b/tests/png/fan_guard.png
index 05fc2b8..7c9d5fe 100644
Binary files a/tests/png/fan_guard.png and b/tests/png/fan_guard.png differ