diff --git a/src/main/java/me/chayapak1/chomensbot_mabe/Configuration.java b/src/main/java/me/chayapak1/chomensbot_mabe/Configuration.java
index c025772d..21678b6b 100644
--- a/src/main/java/me/chayapak1/chomensbot_mabe/Configuration.java
+++ b/src/main/java/me/chayapak1/chomensbot_mabe/Configuration.java
@@ -13,7 +13,7 @@ public class Configuration {
 
     public static class Core {
         @Getter public int layers = 3;
-//        @Getter public int refillInterval = 60 * 1000;
+        @Getter public int refillInterval = 60 * 1000;
         @Getter public String customName = "[{\"text\":\"ChomeNS \",\"color\":\"yellow\"},{\"text\":\"Core\",\"color\":\"green\"},{\"text\":\"™\",\"color\":\"gold\"}]";
     }
 
diff --git a/src/main/java/me/chayapak1/chomensbot_mabe/plugins/CorePlugin.java b/src/main/java/me/chayapak1/chomensbot_mabe/plugins/CorePlugin.java
index 291506b3..27e06ce5 100644
--- a/src/main/java/me/chayapak1/chomensbot_mabe/plugins/CorePlugin.java
+++ b/src/main/java/me/chayapak1/chomensbot_mabe/plugins/CorePlugin.java
@@ -1,13 +1,28 @@
 package me.chayapak1.chomensbot_mabe.plugins;
 
+import com.github.steveice10.mc.protocol.data.game.entity.metadata.ItemStack;
+import com.github.steveice10.mc.protocol.data.game.entity.object.Direction;
+import com.github.steveice10.mc.protocol.data.game.entity.player.Hand;
+import com.github.steveice10.mc.protocol.data.game.entity.player.PlayerAction;
 import com.github.steveice10.mc.protocol.data.game.level.block.CommandBlockMode;
 import com.github.steveice10.mc.protocol.packet.ingame.serverbound.inventory.ServerboundSetCommandBlockPacket;
+import com.github.steveice10.mc.protocol.packet.ingame.serverbound.inventory.ServerboundSetCreativeModeSlotPacket;
+import com.github.steveice10.mc.protocol.packet.ingame.serverbound.player.ServerboundPlayerActionPacket;
+import com.github.steveice10.mc.protocol.packet.ingame.serverbound.player.ServerboundUseItemOnPacket;
+import com.github.steveice10.opennbt.tag.builtin.ByteTag;
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.github.steveice10.opennbt.tag.builtin.StringTag;
+import com.github.steveice10.opennbt.tag.builtin.Tag;
+import com.github.steveice10.packetlib.Session;
 import com.nukkitx.math.vector.Vector3i;
 import lombok.Getter;
 import me.chayapak1.chomensbot_mabe.Bot;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 public class CorePlugin extends PositionPlugin.PositionListener {
     private final Bot bot;
@@ -92,13 +107,14 @@ public class CorePlugin extends PositionPlugin.PositionListener {
 
         if (!ready) {
             ready = true;
+            bot.executor().schedule(this::refill, bot.config().core().refillInterval(), TimeUnit.MILLISECONDS);
             for (Listener listener : listeners) listener.ready();
         }
     }
 
     public void refill () {
         final String command = String.format(
-                "/minecraft:fill %s %s %s %s %s %s minecraft:command_block{CustomName:'%s'}",
+                "minecraft:fill %s %s %s %s %s %s minecraft:command_block{CustomName:'%s'}",
 
                 coreStart.getX() + origin.getX(),
                 coreStart.getY(),
@@ -111,26 +127,25 @@ public class CorePlugin extends PositionPlugin.PositionListener {
                 bot.config().core().customName()
         );
 
-        bot.chat().send(command);
+//        bot.chat().send(command);
 
-        // no work :(
-//        CompoundTag tag = new CompoundTag("tag");
-//        CompoundTag blockEntityTag = new CompoundTag("BlockEntityTag");
-//        blockEntityTag.getValue().put("Command", new StringTag("Command", command));
-//        blockEntityTag.getValue().put("auto", new ByteTag("auto", (byte) 1));
-//        blockEntityTag.getValue().put("TrackOutput", new ByteTag("TrackOutput", (byte) 1));
-//        tag.getValue().put("BlockEntityTag", blockEntityTag);
-//
-//        final Vector3i temporaryBlockPosition = Vector3i.from(
-//                bot.position().position().getX(),
-//                bot.position().position().getX() - 1,
-//                bot.position().position().getZ()
-//        );
-//
-//        final Session session = bot.session();
-//        session.send(new ServerboundSetCreativeModeSlotPacket(45, new ItemStack(347 /* command block id */, 64, tag)));
-//        session.send(new ServerboundPlayerActionPacket(PlayerAction.START_DIGGING, temporaryBlockPosition, Direction.NORTH, 0));
-//        session.send(new ServerboundUseItemOnPacket(temporaryBlockPosition, Direction.NORTH, Hand.OFF_HAND, 0.5f, 0.5f, 0.5f, false, 0));
+        Map<String, Tag> tag = new HashMap<>();
+        Map<String, Tag> blockEntityTag = new HashMap<>();
+        blockEntityTag.put("Command", new StringTag("Command", command));
+        blockEntityTag.put("auto", new ByteTag("auto", (byte) 1));
+        blockEntityTag.put("TrackOutput", new ByteTag("TrackOutput", (byte) 1));
+        tag.put("BlockEntityTag", new CompoundTag("BlockEntityTag", blockEntityTag));
+
+        final Vector3i temporaryBlockPosition = Vector3i.from(
+                bot.position().position().getX(),
+                bot.position().position().getY() - 1,
+                bot.position().position().getZ()
+        );
+
+        final Session session = bot.session();
+        session.send(new ServerboundSetCreativeModeSlotPacket(36, new ItemStack(347 /* command block id */, 64, new CompoundTag("", tag))));
+        session.send(new ServerboundPlayerActionPacket(PlayerAction.START_DIGGING, temporaryBlockPosition, Direction.NORTH, 0));
+        session.send(new ServerboundUseItemOnPacket(temporaryBlockPosition, Direction.UP, Hand.MAIN_HAND, 0.5f, 0.5f, 0.5f, false, 1));
     }
 
     public static class Listener {
diff --git a/src/main/java/me/chayapak1/chomensbot_mabe/plugins/PositionPlugin.java b/src/main/java/me/chayapak1/chomensbot_mabe/plugins/PositionPlugin.java
index 8b39bbd7..f0174936 100644
--- a/src/main/java/me/chayapak1/chomensbot_mabe/plugins/PositionPlugin.java
+++ b/src/main/java/me/chayapak1/chomensbot_mabe/plugins/PositionPlugin.java
@@ -32,9 +32,10 @@ public class PositionPlugin extends SessionAdapter {
     }
 
     public void packetReceived (ClientboundPlayerPositionPacket packet) {
+        bot.session().send(new ServerboundAcceptTeleportationPacket(packet.getTeleportId()));
+
         position = Vector3i.from(packet.getX(), packet.getY(), packet.getZ());
         for (PositionListener listener : listeners) { listener.positionChange(position); }
-        bot.session().send(new ServerboundAcceptTeleportationPacket(packet.getTeleportId()));
     }
 
     public void addListener (PositionListener listener) { listeners.add(listener); }
diff --git a/src/main/resources/default-config.yml b/src/main/resources/default-config.yml
index a3f05bb5..fb00c105 100644
--- a/src/main/resources/default-config.yml
+++ b/src/main/resources/default-config.yml
@@ -4,8 +4,7 @@ keys:
   ownerKey: 'OwnerHash™ key here'
 core:
   layers: 3
-  # will add refill interval later after the bot can place command blocks to refill core
-  # refillInterval: 60000
+  refillInterval: 60000
   # PLEASE give valid JSON component here else the core don't refill at all
   customName: '[{"text":"ChomeNS ","color":"yellow"},{"text":"Core","color":"green"},{"text":"™","color":"gold"}]'
 selfCare: