diff --git a/modules/wafer.scad b/modules/wafer.scad
index c30a78a..c0deed5 100644
--- a/modules/wafer.scad
+++ b/modules/wafer.scad
@@ -3,9 +3,9 @@
 
 // [TODO] try add the flat edge on to the wafer
 module wafer(d) {
-    color([128/255, 128/255, 128/255]) {
-        translate([0, 0, -1]) {
-            circle(r=d/2);
-        }
+    if ($preview) {
+        color([128/255, 128/255, 128/255])
+        translate([0, 0, -1])
+        circle(r=d/2);
     }
 }