diff --git a/kobrax_moonraker_bridge.py b/kobrax_moonraker_bridge.py
index 2147440..88ba52f 100644
--- a/kobrax_moonraker_bridge.py
+++ b/kobrax_moonraker_bridge.py
@@ -4392,6 +4392,45 @@ function openFilamentDialog(slots){
     return {slot_index:i,color_hex:s.color_hex,material:s.material};
   });
 
+  // Default mapping strategy:
+  // 1) keep order where possible (row i -> nearest compatible slot i)
+  // 2) keep defaults unique while compatible slots are available
+  // 3) use color proximity as tie-breaker
+  function _hexToRgb(hex){
+    var c=(hex||'').replace('#','');
+    if(c.length===3)c=c[0]+c[0]+c[1]+c[1]+c[2]+c[2];
+    if(c.length<6)return [255,255,255];
+    return [parseInt(c.slice(0,2),16),parseInt(c.slice(2,4),16),parseInt(c.slice(4,6),16)];
+  }
+  function _colorDist(a,b){
+    var ar=_hexToRgb(a), br=_hexToRgb(b);
+    var dr=ar[0]-br[0], dg=ar[1]-br[1], db=ar[2]-br[2];
+    return (dr*dr + dg*dg + db*db);
+  }
+  var defaultSlotByPaint={};
+  var usedDefaultSlot={};
+  channels.forEach(function(gc,i){
+    var compatible=_amsSlots.filter(function(s){
+      return _materialsCompatible(gc.material, s.material);
+    });
+    if(!compatible.length){
+      defaultSlotByPaint[i]=-1;
+      return;
+    }
+
+    var ranked=compatible.slice().sort(function(a,b){
+      var da=Math.abs((a.slot_index||0)-i), db=Math.abs((b.slot_index||0)-i);
+      if(da!==db)return da-db;
+      var ca=_colorDist(gc.color_hex, a.color_hex), cb=_colorDist(gc.color_hex, b.color_hex);
+      if(ca!==cb)return ca-cb;
+      return (a.slot_index||0)-(b.slot_index||0);
+    });
+
+    var chosen=ranked.find(function(s){return !usedDefaultSlot[s.slot_index];}) || ranked[0];
+    defaultSlotByPaint[i]=chosen?chosen.slot_index:-1;
+    if(chosen) usedDefaultSlot[chosen.slot_index]=1;
+  });
+
   if(!_amsSlots.length){
     body.innerHTML='<p style="color:var(--txt2);font-size:13px;text-align:center;padding:16px 0">Keine belegten AMS-Slots.<br>Druck trotzdem starten?</p>';
   } else {
@@ -4402,8 +4441,8 @@ function openFilamentDialog(slots){
         return _materialsCompatible(gc.material, s.material);
       });
 
-      // Default mapping by ordinal row position into compatible loaded slots.
-      var defaultSlot=compatible.length?compatible[Math.min(i, compatible.length-1)]:null;
+      var defaultSlotIndex=(defaultSlotByPaint.hasOwnProperty(i)?defaultSlotByPaint[i]:-1);
+      var defaultSlot=compatible.find(function(s){return s.slot_index===defaultSlotIndex;})||null;
       var opts=compatible.map(function(s){
         var sel=(defaultSlot&&s.slot_index===defaultSlot.slot_index)?'selected':'';
         return '<option value="'+s.slot_index+'" data-color="'+s.color_hex+'" data-material="'+s.material+'" '+sel+'>'+