diff --git a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/CustomFishingProvider.java b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/CustomFishingProvider.java
index 6d1300ded..c8e7cbb25 100644
--- a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/CustomFishingProvider.java
+++ b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/CustomFishingProvider.java
@@ -14,7 +14,7 @@ import java.util.Optional;
 public class CustomFishingProvider implements ExternalItemProvider<ItemStack> {
     @Override
     public String plugin() {
-        return "CustomFishing";
+        return "customfishing";
     }
 
     @SuppressWarnings("UnstableApiUsage")
diff --git a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MMOItemsProvider.java b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MMOItemsProvider.java
index 49d38b9f9..8888553e4 100644
--- a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MMOItemsProvider.java
+++ b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MMOItemsProvider.java
@@ -15,18 +15,22 @@ public class MMOItemsProvider implements ExternalItemProvider<ItemStack> {
 
     @Override
     public String plugin() {
-        return "MMOItems";
+        return "mmoitems";
     }
 
     @Override
     public @Nullable ItemStack build(String id, ItemBuildContext context) {
         String[] split = id.split(":", 2);
+        if (split.length == 1) {
+            split = split[0].split("_", 2);
+        }
+        if (split.length == 1) return new ItemStack(Material.AIR);
         MMOItem mmoItem = MMOItems.plugin.getMMOItem(Type.get(split[0]), split[1].toUpperCase());
         return mmoItem == null ? new ItemStack(Material.AIR) : requireNonNull(mmoItem.newBuilder().build());
     }
 
     @Override
     public String id(ItemStack item) {
-        return MMOItems.getType(item) + ":" + MMOItems.getID(item);
+        return MMOItems.getType(item) + "_" + MMOItems.getID(item);
     }
 }
diff --git a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MythicMobsProvider.java b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MythicMobsProvider.java
index 21df07ef8..70c111499 100644
--- a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MythicMobsProvider.java
+++ b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/MythicMobsProvider.java
@@ -11,7 +11,7 @@ public class MythicMobsProvider implements ExternalItemProvider<ItemStack> {
 
     @Override
     public String plugin() {
-        return "MythicMobs";
+        return "mythicmobs";
     }
 
     @Nullable
diff --git a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/NeigeItemsProvider.java b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/NeigeItemsProvider.java
index d4b79a345..a6b5ca3ec 100644
--- a/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/NeigeItemsProvider.java
+++ b/bukkit/compatibility/src/main/java/net/momirealms/craftengine/bukkit/compatibility/item/NeigeItemsProvider.java
@@ -12,7 +12,7 @@ public class NeigeItemsProvider implements ExternalItemProvider<ItemStack> {
 
     @Override
     public String plugin() {
-        return "NeigeItems";
+        return "neigeitems";
     }
 
     @Override
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java
index 2158202eb..ab907daee 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java
@@ -77,6 +77,21 @@ public class BukkitItemManager extends AbstractItemManager<ItemStack> {
         this.emptyUniqueItem = new UniqueIdItem<>(UniqueKey.AIR, this.emptyItem);
     }
 
+    @SuppressWarnings("unchecked")
+    @Override
+    public void delayedLoad() {
+        super.delayedLoad();
+        List<ExternalItemProvider<ItemStack>> sources = new ArrayList<>();
+        for (String externalSource : Config.recipeIngredientSources()) {
+            String sourceId = externalSource.toLowerCase(Locale.ENGLISH);
+            ExternalItemProvider<ItemStack> provider = getExternalItemProvider(sourceId);
+            if (provider != null) {
+                sources.add(provider);
+            }
+        }
+        this.factory.resetRecipeIngredientSources(sources.isEmpty() ? null : sources.toArray(new ExternalItemProvider[0]));
+    }
+
     @Override
     public UniqueIdItem<ItemStack> uniqueEmptyItem() {
         return this.emptyUniqueItem;
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java
index 591369a9f..7ea6d8056 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java
@@ -6,22 +6,28 @@ import net.momirealms.craftengine.bukkit.plugin.reflection.minecraft.CoreReflect
 import net.momirealms.craftengine.bukkit.plugin.reflection.minecraft.MBuiltInRegistries;
 import net.momirealms.craftengine.bukkit.util.ItemTags;
 import net.momirealms.craftengine.bukkit.util.KeyUtils;
+import net.momirealms.craftengine.core.item.ExternalItemProvider;
 import net.momirealms.craftengine.core.item.ItemFactory;
 import net.momirealms.craftengine.core.item.ItemKeys;
 import net.momirealms.craftengine.core.item.ItemWrapper;
 import net.momirealms.craftengine.core.item.data.JukeboxPlayable;
 import net.momirealms.craftengine.core.item.setting.EquipmentData;
 import net.momirealms.craftengine.core.plugin.CraftEngine;
+import net.momirealms.craftengine.core.util.CharacterUtils;
 import net.momirealms.craftengine.core.util.Key;
+import net.momirealms.craftengine.core.util.StringUtils;
 import net.momirealms.craftengine.core.util.UniqueKey;
 import net.momirealms.sparrow.nbt.Tag;
 import org.bukkit.Bukkit;
 import org.bukkit.inventory.ItemStack;
 
+import java.util.Locale;
 import java.util.Objects;
 import java.util.Optional;
 
 public abstract class BukkitItemFactory<W extends ItemWrapper<ItemStack>> extends ItemFactory<W, ItemStack> {
+    private boolean hasExternalRecipeSource = false;
+    private ExternalItemProvider<ItemStack>[] recipeIngredientSources = null;
 
     protected BukkitItemFactory(CraftEngine plugin) {
         super(plugin);
@@ -52,6 +58,16 @@ public abstract class BukkitItemFactory<W extends ItemWrapper<ItemStack>> extend
         }
     }
 
+    public void resetRecipeIngredientSources(ExternalItemProvider<ItemStack>[] recipeIngredientSources) {
+        if (recipeIngredientSources == null || recipeIngredientSources.length == 0) {
+            this.recipeIngredientSources = null;
+            this.hasExternalRecipeSource = false;
+        } else {
+            this.recipeIngredientSources = recipeIngredientSources;
+            this.hasExternalRecipeSource = true;
+        }
+    }
+
     @SuppressWarnings("deprecation")
     @Override
     protected byte[] toByteArray(W item) {
@@ -82,6 +98,14 @@ public abstract class BukkitItemFactory<W extends ItemWrapper<ItemStack>> extend
 
     @Override
     protected UniqueKey recipeIngredientID(W item) {
+        if (this.hasExternalRecipeSource) {
+           for (ExternalItemProvider<ItemStack> source : this.recipeIngredientSources) {
+               String id = source.id(item.getItem());
+               if (id != null) {
+                   return UniqueKey.create(Key.of(source.plugin(), StringUtils.toLowerCase(id)));
+               }
+           }
+        }
         return UniqueKey.create(id(item));
     }
 
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/BukkitCraftEngine.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/BukkitCraftEngine.java
index 6cdb33ec7..ac1028f94 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/BukkitCraftEngine.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/BukkitCraftEngine.java
@@ -227,7 +227,6 @@ public class BukkitCraftEngine extends CraftEngine {
                 }
             }, 1, 1);
         }
-        super.compatibilityManager().onDelayedEnable();
     }
 
     @Override
diff --git a/common-files/src/main/resources/config.yml b/common-files/src/main/resources/config.yml
index 06eb8285b..0e96af5e6 100644
--- a/common-files/src/main/resources/config.yml
+++ b/common-files/src/main/resources/config.yml
@@ -296,6 +296,8 @@ recipe:
     # Selective recipe disabling (safer alternative to 'all: true')
     # Example: ["minecraft:wooden_sword", "minecraft:stone_hoe"]
     list: []
+  # You can use items from other plugins by adding the supported plugin names here
+  ingredient-sources: []
 
 gui:
   browser:
diff --git a/core/src/main/java/net/momirealms/craftengine/core/item/AbstractItemManager.java b/core/src/main/java/net/momirealms/craftengine/core/item/AbstractItemManager.java
index ae246230c..34a97ec8d 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/item/AbstractItemManager.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/item/AbstractItemManager.java
@@ -105,6 +105,7 @@ public abstract class AbstractItemManager<I> extends AbstractModelGenerator impl
 
     @Override
     public boolean registerExternalItemProvider(ExternalItemProvider<I> externalItemProvider) {
+        if (!ResourceLocation.isValidNamespace(externalItemProvider.plugin())) return false;
         if (this.externalItemProviders.containsKey(externalItemProvider.plugin())) return false;
         this.externalItemProviders.put(externalItemProvider.plugin(), externalItemProvider);
         return true;
@@ -510,7 +511,7 @@ public abstract class AbstractItemManager<I> extends AbstractModelGenerator impl
             Map<String, Object> data = MiscUtils.castToMap(obj, false);
             String plugin = data.get("plugin").toString();
             String id = data.get("id").toString();
-            ExternalItemProvider<I> provider = AbstractItemManager.this.getExternalItemProvider(plugin);
+            ExternalItemProvider<I> provider = AbstractItemManager.this.getExternalItemProvider(plugin.toLowerCase(Locale.ENGLISH));
             return new ExternalModifier<>(id, Objects.requireNonNull(provider, "Item provider " + plugin + " not found"));
         }, "external");
         if (VersionHelper.isOrAbove1_20_5()) {
diff --git a/core/src/main/java/net/momirealms/craftengine/core/plugin/CraftEngine.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/CraftEngine.java
index ea29e3598..7cc4f0f3f 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/plugin/CraftEngine.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/CraftEngine.java
@@ -217,6 +217,7 @@ public abstract class CraftEngine implements Plugin {
             this.fontManager.delayedInit();
             this.vanillaLootManager.delayedInit();
             this.advancementManager.delayedInit();
+            this.compatibilityManager.onDelayedEnable();
             // reload the plugin
             try {
                 this.reloadPlugin(Runnable::run, Runnable::run, true);
diff --git a/core/src/main/java/net/momirealms/craftengine/core/util/StringUtils.java b/core/src/main/java/net/momirealms/craftengine/core/util/StringUtils.java
index a0cbe3adb..4c44e0054 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/util/StringUtils.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/util/StringUtils.java
@@ -25,4 +25,18 @@ public final class StringUtils {
         result[index] = s.substring(start);
         return result;
     }
+
+    public static String toLowerCase(String str) {
+        if (str == null) {
+            return null;
+        }
+        char[] chars = str.toCharArray();
+        for (int i = 0; i < chars.length; i++) {
+            char c = chars[i];
+            if (c >= 'A' && c <= 'Z') {
+                chars[i] = (char) (c + 32);
+            }
+        }
+        return new String(chars);
+    }
 }
diff --git a/gradle.properties b/gradle.properties
index 15f69b2fb..f397c7222 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,7 +3,7 @@ org.gradle.jvmargs=-Xmx1G
 # Project settings
 # Rule: [major update].[feature update].[bug fix]
 project_version=0.0.60.1
-config_version=41
+config_version=42
 lang_version=22
 project_group=net.momirealms
 latest_supported_version=1.21.7