diff --git a/src/main/java/mcjty/xnet/blocks/cables/ConnectorBlock.java b/src/main/java/mcjty/xnet/blocks/cables/ConnectorBlock.java
index 8144b7c0..96f0914a 100644
--- a/src/main/java/mcjty/xnet/blocks/cables/ConnectorBlock.java
+++ b/src/main/java/mcjty/xnet/blocks/cables/ConnectorBlock.java
@@ -448,4 +448,18 @@ public static boolean isAdvancedConnector(World world, BlockPos pos) {
     public boolean isAdvancedConnector() {
         return false;
     }
+
+    @Override
+    public AxisAlignedBB getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
+        AxisAlignedBB boundingBox = AABB_CENTER;
+        for (EnumFacing facing : EnumFacing.VALUES) {
+            ConnectorType connectorType = getConnectorType(state.getValue(COLOR), source, pos, facing);
+            if (connectorType == ConnectorType.CABLE) {
+                boundingBox = boundingBox.union(AABBS[facing.getIndex()]);
+            } else if (connectorType == ConnectorType.BLOCK) {
+                boundingBox = boundingBox.union(AABBS_CONNECTOR[facing.getIndex()]);
+            }
+        }
+        return boundingBox;
+    }
 }
diff --git a/src/main/java/mcjty/xnet/blocks/cables/NetCableBlock.java b/src/main/java/mcjty/xnet/blocks/cables/NetCableBlock.java
index 36de8446..244fa3bf 100644
--- a/src/main/java/mcjty/xnet/blocks/cables/NetCableBlock.java
+++ b/src/main/java/mcjty/xnet/blocks/cables/NetCableBlock.java
@@ -13,6 +13,7 @@
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.NonNullList;
+import net.minecraft.util.math.AxisAlignedBB;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
@@ -80,4 +81,14 @@ protected ConnectorType getConnectorType(@Nonnull CableColor color, IBlockAccess
         }
     }
 
+    @Override
+    public AxisAlignedBB getBoundingBox(IBlockState state, IBlockAccess source, BlockPos pos) {
+        AxisAlignedBB boundingBox = AABB_CENTER;
+        for (EnumFacing facing : EnumFacing.VALUES) {
+            if (getConnectorType(state.getValue(COLOR), source, pos, facing) != ConnectorType.NONE) {
+                boundingBox = boundingBox.union(AABBS[facing.getIndex()]);
+            }
+        }
+        return boundingBox;
+    }
 }
diff --git a/src/main/java/mcjty/xnet/blocks/facade/FacadeItemBlock.java b/src/main/java/mcjty/xnet/blocks/facade/FacadeItemBlock.java
index e4534170..69839ad2 100644
--- a/src/main/java/mcjty/xnet/blocks/facade/FacadeItemBlock.java
+++ b/src/main/java/mcjty/xnet/blocks/facade/FacadeItemBlock.java
@@ -15,6 +15,7 @@
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.*;
+import net.minecraft.util.math.AxisAlignedBB;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.text.TextComponentString;
 import net.minecraft.util.text.TextFormatting;
@@ -66,39 +67,55 @@ public EnumActionResult onItemUse(EntityPlayer player, World world, BlockPos pos
         ItemStack itemstack = player.getHeldItem(hand);
 
         if (!itemstack.isEmpty()) {
-
-            if (block == NetCableSetup.netCableBlock) {
-                int i = this.getMetadata(itemstack.getMetadata());
-                FacadeBlock facadeBlock = (FacadeBlock) this.block;
-                IBlockState placementState = facadeBlock.getPlacementState(world, pos, facing, hitX, hitY, hitZ, i, player).withProperty(GenericCableBlock.COLOR, state.getValue(GenericCableBlock.COLOR));
-
-                if (placeBlockAt(itemstack, player, world, pos, facing, hitX, hitY, hitZ, placementState)) {
-                    SoundType soundtype = world.getBlockState(pos).getBlock().getSoundType(world.getBlockState(pos), world, pos, player);
-                    world.playSound(player, pos, soundtype.getPlaceSound(), SoundCategory.BLOCKS, (soundtype.getVolume() + 1.0F) / 2.0F, soundtype.getPitch() * 0.8F);
-                    TileEntity te = world.getTileEntity(pos);
-                    if (te instanceof FacadeTileEntity) {
-                        ((FacadeTileEntity) te).setMimicBlock(getMimicBlock(itemstack));
+            if (block == NetCableSetup.netCableBlock || block == NetCableSetup.connectorBlock || block == NetCableSetup.advancedConnectorBlock) {
+                IBlockState mimicBlock = getMimicBlock(itemstack);
+                if (!canMimicFit(state.getBoundingBox(world, pos), mimicBlock.getBoundingBox(world, pos))) {
+                    if (world.isRemote) {
+                        player.sendStatusMessage(new TextComponentString(mimicBlock.getBlock().getLocalizedName() + " is too small to fit"), false);
                     }
-                    int amount = -1;
-                    itemstack.grow(amount);
+                    return EnumActionResult.FAIL;
                 }
-            } else if (block == NetCableSetup.connectorBlock || block == NetCableSetup.advancedConnectorBlock) {
-                TileEntity te = world.getTileEntity(pos);
-                if (te instanceof ConnectorTileEntity) {
-                    ConnectorTileEntity connectorTileEntity = (ConnectorTileEntity) te;
-                    if (connectorTileEntity.getMimicBlock() == null) {
-                        connectorTileEntity.setMimicBlock(getMimicBlock(itemstack));
+
+                if (block == NetCableSetup.netCableBlock) {
+                    int i = this.getMetadata(itemstack.getMetadata());
+                    FacadeBlock facadeBlock = (FacadeBlock) this.block;
+                    IBlockState placementState = facadeBlock.getPlacementState(world, pos, facing, hitX, hitY, hitZ, i, player).withProperty(GenericCableBlock.COLOR, state.getValue(GenericCableBlock.COLOR));
+
+                    if (placeBlockAt(itemstack, player, world, pos, facing, hitX, hitY, hitZ, placementState)) {
                         SoundType soundtype = world.getBlockState(pos).getBlock().getSoundType(world.getBlockState(pos), world, pos, player);
                         world.playSound(player, pos, soundtype.getPlaceSound(), SoundCategory.BLOCKS, (soundtype.getVolume() + 1.0F) / 2.0F, soundtype.getPitch() * 0.8F);
+                        TileEntity te = world.getTileEntity(pos);
+                        if (te instanceof FacadeTileEntity) {
+                            ((FacadeTileEntity) te).setMimicBlock(mimicBlock);
+                        }
                         int amount = -1;
                         itemstack.grow(amount);
-                    } else {
-                        return EnumActionResult.FAIL;
+                    }
+                } else {
+                    TileEntity te = world.getTileEntity(pos);
+                    if (te instanceof ConnectorTileEntity) {
+                        ConnectorTileEntity connectorTileEntity = (ConnectorTileEntity) te;
+                        if (connectorTileEntity.getMimicBlock() == null) {
+                            connectorTileEntity.setMimicBlock(mimicBlock);
+                            SoundType soundtype = world.getBlockState(pos).getBlock().getSoundType(world.getBlockState(pos), world, pos, player);
+                            world.playSound(player, pos, soundtype.getPlaceSound(), SoundCategory.BLOCKS, (soundtype.getVolume() + 1.0F) / 2.0F, soundtype.getPitch() * 0.8F);
+                            int amount = -1;
+                            itemstack.grow(amount);
+                        } else {
+                            return EnumActionResult.FAIL;
+                        }
                     }
                 }
             } else if (block == ModBlocks.facadeBlock) {
                 return EnumActionResult.FAIL;
             } else {
+                if (!canMimicFit(GenericCableBlock.AABB_CENTER, state.getBoundingBox(world, pos))) {
+                    if (world.isRemote) {
+                        player.sendStatusMessage(new TextComponentString(block.getLocalizedName() + " is too small to mimic"), false);
+                    }
+                    return EnumActionResult.FAIL;
+                }
+
                 setMimicBlock(itemstack, state);
                 if (world.isRemote) {
                     player.sendStatusMessage(new TextComponentString("Facade is now mimicing " + block.getLocalizedName()), false);
@@ -129,4 +146,8 @@ public void addInformation(ItemStack stack, @Nullable World playerIn, List<Strin
             }
         }
     }
+
+    public boolean canMimicFit(AxisAlignedBB cableBB, AxisAlignedBB mimicBB) {
+        return mimicBB.minX <= cableBB.minX && mimicBB.maxX >= cableBB.maxX && mimicBB.minY <= cableBB.maxY && mimicBB.maxY >= cableBB.maxY && mimicBB.minZ <= cableBB.minZ && mimicBB.maxZ >= cableBB.maxZ;
+    }
 }