diff --git a/src/main/java/refinedstorage/api/storage/item/IGroupedItemStorage.java b/src/main/java/refinedstorage/api/storage/item/IGroupedItemStorage.java
index 6e6bd8bc5..b1c2292d7 100755
--- a/src/main/java/refinedstorage/api/storage/item/IGroupedItemStorage.java
+++ b/src/main/java/refinedstorage/api/storage/item/IGroupedItemStorage.java
@@ -64,6 +64,13 @@ public interface IGroupedItemStorage {
     @Nullable
     ItemStack get(int hash);
 
+    /**
+     * Copies a grouped item storage.
+     *
+     * @return the storage
+     */
+    IGroupedItemStorage copy();
+
     /**
      * @return all items in this storage network
      */
diff --git a/src/main/java/refinedstorage/apiimpl/autocrafting/v2/CraftingTask.java b/src/main/java/refinedstorage/apiimpl/autocrafting/v2/CraftingTask.java
index 1c57409b7..55307e736 100755
--- a/src/main/java/refinedstorage/apiimpl/autocrafting/v2/CraftingTask.java
+++ b/src/main/java/refinedstorage/apiimpl/autocrafting/v2/CraftingTask.java
@@ -4,10 +4,12 @@ import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.Multimap;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraftforge.items.ItemHandlerHelper;
 import refinedstorage.api.autocrafting.ICraftingPattern;
 import refinedstorage.api.network.INetworkMaster;
 import refinedstorage.api.network.NetworkUtils;
 import refinedstorage.api.storage.CompareUtils;
+import refinedstorage.api.storage.item.IGroupedItemStorage;
 
 import java.util.ArrayDeque;
 import java.util.Deque;
@@ -19,6 +21,7 @@ public class CraftingTask {
     private Deque<ItemStack> toTake = new ArrayDeque<>();
     private Multimap<Item, ItemStack> toCraft = ArrayListMultimap.create();
     private Multimap<Item, ItemStack> missing = ArrayListMultimap.create();
+    private Multimap<Item, ItemStack> extras = ArrayListMultimap.create();
 
     public CraftingTask(INetworkMaster network, ICraftingPattern pattern, int quantity) {
         this.network = network;
@@ -31,30 +34,44 @@ public class CraftingTask {
     }
 
     private void calculate(ICraftingPattern pattern, boolean basePattern) {
+        IGroupedItemStorage itemStorage = network.getItemStorage().copy();
+
         for (int i = 0; i < quantity; ++i) {
             for (ItemStack input : pattern.getInputs()) {
-                ItemStack inputInNetwork = network.getItemStorage().get(input, CompareUtils.COMPARE_DAMAGE | CompareUtils.COMPARE_NBT);
+                ItemStack inputInNetwork = itemStorage.get(input, CompareUtils.COMPARE_DAMAGE | CompareUtils.COMPARE_NBT);
 
                 if (inputInNetwork == null || inputInNetwork.stackSize == 0) {
-                    ICraftingPattern inputPattern = NetworkUtils.getPattern(network, input);
-
-                    if (inputPattern != null) {
-                        addToCraft(input);
-
-                        calculate(inputPattern, false);
+                    if (getExtrasFor(input) != null) {
+                        decrOrRemoveExtras(input);
                     } else {
-                        addMissing(input);
+                        ICraftingPattern inputPattern = NetworkUtils.getPattern(network, input);
+
+                        if (inputPattern != null) {
+                            for (ItemStack output : inputPattern.getOutputs()) {
+                                addToCraft(output);
+                            }
+
+                            calculate(inputPattern, false);
+                        } else {
+                            addMissing(input);
+                        }
                     }
                 } else {
                     toTake.push(input);
+
+                    itemStorage.remove(input);
                 }
             }
+
+            if (!basePattern) {
+                pattern.getOutputs().stream().filter(o -> o.stackSize > 1).forEach(o -> addExtras(ItemHandlerHelper.copyStackWithSize(o, o.stackSize - 1)));
+            }
         }
     }
 
     @Override
     public String toString() {
-        return "quantity=" + quantity + ",toTake=" + toTake.toString() + ",toCraft=" + toCraft.toString() + ",missing=" + missing.toString();
+        return "{quantity=" + quantity + ",toTake=" + toTake.toString() + ",toCraft=" + toCraft.toString() + ",missing=" + missing.toString() + "}";
     }
 
     public boolean update() {
@@ -95,6 +112,36 @@ public class CraftingTask {
         missing.put(stack.getItem(), stack.copy());
     }
 
+    private void addExtras(ItemStack stack) {
+        ItemStack extras = getExtrasFor(stack);
+
+        if (extras != null) {
+            extras.stackSize += stack.stackSize;
+        } else {
+            this.extras.put(stack.getItem(), stack.copy());
+        }
+    }
+
+    private ItemStack getExtrasFor(ItemStack stack) {
+        for (ItemStack m : extras.get(stack.getItem())) {
+            if (CompareUtils.compareStackNoQuantity(m, stack)) {
+                return m;
+            }
+        }
+
+        return null;
+    }
+
+    private void decrOrRemoveExtras(ItemStack stack) {
+        ItemStack extras = getExtrasFor(stack);
+
+        extras.stackSize--;
+
+        if (extras.stackSize == 0) {
+            this.extras.remove(extras.getItem(), extras);
+        }
+    }
+
     private void addToCraft(ItemStack stack) {
         for (ItemStack m : toCraft.get(stack.getItem())) {
             if (CompareUtils.compareStackNoQuantity(m, stack)) {
diff --git a/src/main/java/refinedstorage/apiimpl/storage/item/GroupedItemStorage.java b/src/main/java/refinedstorage/apiimpl/storage/item/GroupedItemStorage.java
index 8fc055d89..8d9778ed6 100755
--- a/src/main/java/refinedstorage/apiimpl/storage/item/GroupedItemStorage.java
+++ b/src/main/java/refinedstorage/apiimpl/storage/item/GroupedItemStorage.java
@@ -118,6 +118,19 @@ public class GroupedItemStorage implements IGroupedItemStorage {
         return null;
     }
 
+    @Override
+    public IGroupedItemStorage copy() {
+        GroupedItemStorage copy = new GroupedItemStorage(network);
+
+        copy.storages = storages;
+
+        for (ItemStack stack : stacks.values()) {
+            copy.stacks.put(stack.getItem(), stack.copy());
+        }
+
+        return copy;
+    }
+
     @Override
     public Collection<ItemStack> getStacks() {
         return stacks.values();