diff --git a/src/main/java/io/github/thebusybiscuit/sensibletoolbox/SensibleToolboxPlugin.java b/src/main/java/io/github/thebusybiscuit/sensibletoolbox/SensibleToolboxPlugin.java
index 6c763807..af1d2610 100644
--- a/src/main/java/io/github/thebusybiscuit/sensibletoolbox/SensibleToolboxPlugin.java
+++ b/src/main/java/io/github/thebusybiscuit/sensibletoolbox/SensibleToolboxPlugin.java
@@ -172,6 +172,7 @@ public class SensibleToolboxPlugin extends JavaPlugin implements ConfigurationLi
     private MinecraftVersion minecraftVersion = MinecraftVersion.UNKNOWN;
 
     private ConfigurationManager configManager;
+    private boolean slimefunEnabled = false;
     private boolean protocolLibEnabled = false;
     private SoundMufflerListener soundMufflerListener;
     private boolean enabled = false;
@@ -258,6 +259,7 @@ public void onEnable() {
         scheduleEnergyNetTicker();
 
         if (getServer().getPluginManager().isPluginEnabled("Slimefun")) {
+            slimefunEnabled = true;
             new SlimefunBridge(this);
         }
 
@@ -485,6 +487,10 @@ private void setupProtocolLib() {
         }
     }
 
+    public boolean isSlimefunEnabled() {
+        return slimefunEnabled;
+    }
+
     public boolean isProtocolLibEnabled() {
         return protocolLibEnabled;
     }
diff --git a/src/main/java/io/github/thebusybiscuit/sensibletoolbox/items/multibuilder/MultiBuilder.java b/src/main/java/io/github/thebusybiscuit/sensibletoolbox/items/multibuilder/MultiBuilder.java
index d31ae98a..623ae86f 100644
--- a/src/main/java/io/github/thebusybiscuit/sensibletoolbox/items/multibuilder/MultiBuilder.java
+++ b/src/main/java/io/github/thebusybiscuit/sensibletoolbox/items/multibuilder/MultiBuilder.java
@@ -30,8 +30,10 @@
 import org.bukkit.inventory.Recipe;
 import org.bukkit.inventory.ShapedRecipe;
 
+import me.mrCookieSlime.Slimefun.api.BlockStorage;
 import io.github.thebusybiscuit.cscorelib2.inventory.ItemUtils;
 import io.github.thebusybiscuit.cscorelib2.protection.ProtectableAction;
+import io.github.thebusybiscuit.sensibletoolbox.SensibleToolboxPlugin;
 import io.github.thebusybiscuit.sensibletoolbox.api.SensibleToolbox;
 import io.github.thebusybiscuit.sensibletoolbox.api.energy.Chargeable;
 import io.github.thebusybiscuit.sensibletoolbox.api.items.BaseSTBItem;
@@ -253,14 +255,21 @@ private int howMuchDoesPlayerHave(Player p, Material mat) {
     }
 
     protected boolean canReplace(Player player, Block b) {
-        // we won't replace any block which can hold items, or any STB block, or any unbreakable block
+        // Check for non-replaceable block types.
+        // STB Blocks
         if (SensibleToolbox.getBlockAt(b.getLocation(), true) != null) {
             return false;
+        // Vanilla inventories
         } else if (VanillaInventoryUtils.isVanillaInventory(b)) {
             return false;
+        // Slimefun Blocks
+        } else if (SensibleToolboxPlugin.getInstance().isSlimefunEnabled() && BlockStorage.hasBlockInfo(b)) {
+            return false;
+        // Unbreakable Blocks
         } else if (b.getType().getHardness() >= 3600000) {
             return false;
         } else {
+            // Block is replaceable, return permission to break
             return SensibleToolbox.getProtectionManager().hasPermission(player, b, ProtectableAction.BREAK_BLOCK);
         }
     }