diff --git a/src/kiri/mode/fdm/export.js b/src/kiri/mode/fdm/export.js
index a65d6ca9..4b17bd32 100644
--- a/src/kiri/mode/fdm/export.js
+++ b/src/kiri/mode/fdm/export.js
@@ -607,7 +607,9 @@ export function fdm_export(print, online, ondone, ondebug) {
         for (pidx=0; pidx<path.length; pidx++) {
             out = path[pidx];
             speedMMM = (out.speed || process.outputFeedrate) * 60; // range
-            fanSpeed = out.fan ?? fanSpeed;
+            if (!isBelt) {
+                fanSpeed = out.fan ?? fanSpeed;
+            }
 
             // hint to controller that we're working on a specific object
             // so that gcode between start/stop comments can be cancelled
@@ -680,13 +682,13 @@ export function fdm_export(print, online, ondone, ondebug) {
             }
 
             // in belt mode, fan can change per segment (for base)
-            // if (isBelt) {
+            if (isBelt) {
                 setTempFanSpeed(out.fan);
-                if (fanSpeed !== lastFanSpeed) {
-                    appendAllSub(gcodeFan);
-                    lastFanSpeed = fanSpeed;
-                }
-            // }
+            }
+            if (fanSpeed !== lastFanSpeed) {
+                appendAllSub(gcodeFan);
+                lastFanSpeed = fanSpeed;
+            }
 
             if (lastp && out.emit) {
                 if (arcDist) {
diff --git a/web/kiri/index.css b/web/kiri/index.css
index efc8c86d..a3a2f596 100644
--- a/web/kiri/index.css
+++ b/web/kiri/index.css
@@ -1530,6 +1530,10 @@ details[open] summary::after {
     border-radius: 3px;
     text-align: center;
 }
+.dark #op-add-list > div:hover {
+    color: black;
+    background-color: var(--blue-2) !important;
+}
 #op-add-list > div:hover {
     background-color: var(--blue-4);
 }
@@ -1538,9 +1542,6 @@ details[open] summary::after {
     right: 0;
     top: 0;
 }
-#cam-lathe:hover {
-    background-color: rgba(0,0,0,0) !important;
-}
 
 #progress {
     left: 0;