diff --git a/container/implementations/ContainerMAC.java b/container/implementations/ContainerMAC.java
index 1139ac90b..c4137c36a 100644
--- a/container/implementations/ContainerMAC.java
+++ b/container/implementations/ContainerMAC.java
@@ -3,11 +3,17 @@ package appeng.container.implementations;
 import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.inventory.ICrafting;
 import net.minecraft.inventory.IInventory;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
 import appeng.api.config.RedstoneMode;
 import appeng.api.config.SecurityPermissions;
 import appeng.api.config.Settings;
+import appeng.api.crafting.ICraftingPatternDetails;
+import appeng.container.slot.SlotMACPattern;
+import appeng.container.slot.SlotOutput;
 import appeng.container.slot.SlotRestrictedInput;
 import appeng.container.slot.SlotRestrictedInput.PlaceableItemType;
+import appeng.items.misc.ItemEncodedPattern;
 import appeng.tile.crafting.TileMolecularAssembler;
 import appeng.util.Platform;
 
@@ -30,23 +36,45 @@ public class ContainerMAC extends ContainerUpgradeable
 		return false;
 	}
 
+	public boolean isValidItemForSlot(int slotIndex, ItemStack i)
+	{
+		IInventory mac = myte.getInventoryByName( "mac" );
+
+		ItemStack is = mac.getStackInSlot( 10 );
+		if ( is == null )
+			return false;
+
+		if ( is.getItem() instanceof ItemEncodedPattern )
+		{
+			World w = this.getTileEntity().getWorldObj();
+			ItemEncodedPattern iep = (ItemEncodedPattern) is.getItem();
+			ICraftingPatternDetails ph = iep.getPatternForItem( is, w );
+			return ph.isValidItemForSlot( slotIndex, i, w );
+		}
+
+		return false;
+	}
+
 	@Override
 	protected void setupConfig()
 	{
 		int offx = 29;
 		int offy = 30;
 
-		IInventory cells = myte.getInventoryByName( "mac" );
+		IInventory mac = myte.getInventoryByName( "mac" );
 
 		for (int y = 0; y < 3; y++)
 			for (int x = 0; x < 3; x++)
-				addSlotToContainer( new SlotRestrictedInput( PlaceableItemType.STORAGE_CELLS, cells, x + y * 2, offx + x * 18, offy + y * 18 ) );
+			{
+				SlotMACPattern s = new SlotMACPattern( this, mac, x + y * 3, offx + x * 18, offy + y * 18 );
+				addSlotToContainer( s );
+			}
 
 		offx = 126;
 		offy = 16;
 
-		addSlotToContainer( new SlotRestrictedInput( PlaceableItemType.STORAGE_CELLS, cells, 10, offx, offy ) );
-		addSlotToContainer( new SlotRestrictedInput( PlaceableItemType.STORAGE_CELLS, cells, 9, offx, offy + 32 ) );
+		addSlotToContainer( new SlotRestrictedInput( PlaceableItemType.ENCODED_PATTERN, mac, 10, offx, offy ) );
+		addSlotToContainer( new SlotOutput( mac, 9, offx, offy + 32, -1 ) );
 
 		offx = 122;
 		offy = 17;
diff --git a/container/slot/SlotMACPattern.java b/container/slot/SlotMACPattern.java
new file mode 100644
index 000000000..4b024b200
--- /dev/null
+++ b/container/slot/SlotMACPattern.java
@@ -0,0 +1,23 @@
+package appeng.container.slot;
+
+import net.minecraft.inventory.IInventory;
+import net.minecraft.item.ItemStack;
+import appeng.container.implementations.ContainerMAC;
+
+public class SlotMACPattern extends AppEngSlot
+{
+
+	ContainerMAC mac;
+
+	public SlotMACPattern(ContainerMAC mac, IInventory i, int slotIdx, int x, int y) {
+		super( i, slotIdx, x, y );
+		this.mac = mac;
+	}
+
+	@Override
+	public boolean isItemValid(ItemStack i)
+	{
+		return mac.isValidItemForSlot( this.getSlotIndex(), i );
+	}
+
+}
diff --git a/container/slot/SlotRestrictedInput.java b/container/slot/SlotRestrictedInput.java
index 0f54cf579..927a0fef9 100644
--- a/container/slot/SlotRestrictedInput.java
+++ b/container/slot/SlotRestrictedInput.java
@@ -58,7 +58,8 @@ public class SlotRestrictedInput extends AppEngSlot
 	{
 		if ( which == PlaceableItemType.VALID_ENCODED_PATTERN_W_OUPUT )
 		{
-			ICraftingPatternDetails ap = is.getItem() instanceof ICraftingPatternItem ? ((ICraftingPatternItem) is.getItem()).getPatternForItem( is ) : null;
+			ICraftingPatternDetails ap = is.getItem() instanceof ICraftingPatternItem ? ((ICraftingPatternItem) is.getItem()).getPatternForItem( is, theWorld )
+					: null;
 			if ( ap != null )
 				return true;
 			return false;
diff --git a/helpers/PatternHelper.java b/helpers/PatternHelper.java
new file mode 100644
index 000000000..1b561f0d5
--- /dev/null
+++ b/helpers/PatternHelper.java
@@ -0,0 +1,106 @@
+package appeng.helpers;
+
+import net.minecraft.inventory.InventoryCrafting;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.crafting.CraftingManager;
+import net.minecraft.item.crafting.IRecipe;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
+import net.minecraft.world.World;
+import appeng.api.crafting.ICraftingPatternDetails;
+import appeng.api.storage.data.IAEItemStack;
+import appeng.container.ContainerNull;
+import appeng.util.Platform;
+
+public class PatternHelper implements ICraftingPatternDetails
+{
+
+	InventoryCrafting crafting = new InventoryCrafting( new ContainerNull(), 3, 3 );
+	InventoryCrafting testFrame = new InventoryCrafting( new ContainerNull(), 3, 3 );
+
+	ItemStack correctOutput;
+	IRecipe standardRecipe;
+
+	boolean isCrafting = false;
+
+	public PatternHelper(ItemStack is, World w) {
+		NBTTagCompound encodedValue = is.getTagCompound();
+
+		if ( encodedValue == null )
+			return;
+
+		NBTTagList inTag = encodedValue.getTagList( "in", 10 );
+		NBTTagList outTag = encodedValue.getTagList( "out", 10 );
+		isCrafting = encodedValue.getBoolean( "crafting" );
+
+		if ( isCrafting == false )
+			throw new RuntimeException( "Only crafting recipes supported." );
+
+		for (int x = 0; x < inTag.tagCount(); x++)
+		{
+			ItemStack gs = ItemStack.loadItemStackFromNBT( inTag.getCompoundTagAt( x ) );
+			crafting.setInventorySlotContents( x, gs );
+			testFrame.setInventorySlotContents( x, gs );
+		}
+
+		standardRecipe = Platform.findMatchingRecipe( crafting, w );
+		correctOutput = standardRecipe.getCraftingResult( crafting );
+	}
+
+	public boolean isValidItemForSlot(int slotIndex, ItemStack i, World w)
+	{
+		testFrame.setInventorySlotContents( slotIndex, i );
+		boolean result = standardRecipe.matches( testFrame, w );
+
+		if ( result )
+		{
+			ItemStack testOutput = standardRecipe.getCraftingResult( testFrame );
+
+			if ( Platform.isSameItemPrecise( correctOutput, testOutput ) )
+			{
+				testFrame.setInventorySlotContents( slotIndex, crafting.getStackInSlot( slotIndex ) );
+				return true;
+			}
+		}
+		else
+		{
+			ItemStack testOutput = CraftingManager.getInstance().findMatchingRecipe( testFrame, w );
+
+			if ( Platform.isSameItemPrecise( correctOutput, testOutput ) )
+			{
+				testFrame.setInventorySlotContents( slotIndex, crafting.getStackInSlot( slotIndex ) );
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	@Override
+	public boolean canSubstitute()
+	{
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	@Override
+	public boolean isCraftable()
+	{
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	@Override
+	public IAEItemStack[] getInputs()
+	{
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	@Override
+	public IAEItemStack[] getOutputs()
+	{
+		// TODO Auto-generated method stub
+		return null;
+	}
+}
diff --git a/items/misc/ItemEncodedPattern.java b/items/misc/ItemEncodedPattern.java
index eecd635f3..6da2a308e 100644
--- a/items/misc/ItemEncodedPattern.java
+++ b/items/misc/ItemEncodedPattern.java
@@ -7,12 +7,14 @@ import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.nbt.NBTTagList;
+import net.minecraft.world.World;
 import net.minecraftforge.client.MinecraftForgeClient;
 import appeng.api.crafting.ICraftingPatternDetails;
 import appeng.api.implementations.ICraftingPatternItem;
 import appeng.client.render.items.ItemEncodedPatternRenderer;
 import appeng.core.features.AEFeature;
 import appeng.core.localization.GuiText;
+import appeng.helpers.PatternHelper;
 import appeng.items.AEBaseItem;
 import appeng.util.Platform;
 
@@ -128,9 +130,9 @@ public class ItemEncodedPattern extends AEBaseItem implements ICraftingPatternIt
 	}
 
 	@Override
-	public ICraftingPatternDetails getPatternForItem(ItemStack is)
+	public ICraftingPatternDetails getPatternForItem(ItemStack is, World w)
 	{
-		return null;
+		return new PatternHelper( is, w );
 	}
 
 }
diff --git a/tile/crafting/TileMolecularAssembler.java b/tile/crafting/TileMolecularAssembler.java
index 171d815d2..c75998d96 100644
--- a/tile/crafting/TileMolecularAssembler.java
+++ b/tile/crafting/TileMolecularAssembler.java
@@ -71,6 +71,7 @@ public class TileMolecularAssembler extends AENetworkInvTile implements IAEAppEn
 
 	public TileMolecularAssembler() {
 		settings.registerSetting( Settings.REDSTONE_CONTROLLED, RedstoneMode.IGNORE );
+		inv.setMaxStackSize( 1 );
 		addNewHandler( new TileMolecularAssemblerHandler() );
 	}