diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/cuboid2/io/TSchemWriter.java b/BauSystem_Main/src/de/steamwar/bausystem/features/cuboid2/io/TSchemWriter.java
index 5a901363..205db779 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/cuboid2/io/TSchemWriter.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/cuboid2/io/TSchemWriter.java
@@ -75,21 +75,59 @@ public class TSchemWriter implements ClipboardWriter {
             }
             out.writeNamedTag("SizeMinOffset", new ByteArrayTag(bsArray));
 
-            Map<BlockState, BitSet> blockMap = new HashMap<>();
-            typedClipboard.getBlocks().forEach((blockState, blockVector3s) -> {
-                blockMap.put(blockState, new BitSet(volume));
-            });
-            clipboard.getRegion().forEach(blockVector3 -> {
-                int index = blockVector3.getBlockX() + blockVector3.getBlockY() * region.getWidth() + blockVector3.getBlockZ() * region.getWidth() * region.getHeight();
-                for (Map.Entry<BlockState, Set<BlockVector3>> entry : typedClipboard.getBlocks().entrySet()) {
-                    if (entry.getValue().contains(blockVector3)) {
-                        blockMap.get(entry.getKey()).set(index);
+            Map<BlockState, byte[]> blocks = new HashMap<>();
+            for (Map.Entry<BlockState, Set<BlockVector3>> entry : typedClipboard.getBlocks().entrySet()) {
+                BitSet bitSet = new BitSet(volume);
+                for (BlockVector3 blockVector3 : entry.getValue()) {
+                    int index = blockVector3.getBlockX() + blockVector3.getBlockY() * region.getWidth() + blockVector3.getBlockZ() * region.getWidth() * region.getHeight();
+                    bitSet.set(index);
+                }
+                byte[] bytes = bitSet.toByteArray();
+                // RunLengthEncoding
+                List<Byte> bytes2 = new ArrayList<>();
+                int last = -1;
+                int count = 0;
+                for (int i = 0; i < bytes.length; i++) {
+                    byte b = bytes[i];
+                    if (b == last) {
+                        count++;
+                    } else {
+                        if (count > 0) {
+                            writeVarInt((count - 1), bytes2);
+                            bytes2.add((byte) last);
+                        }
+                        last = b;
+                        count = 1;
                     }
                 }
-            });
+                if (count > 0) {
+                    writeVarInt((count - 1), bytes2);
+                    bytes2.add((byte) last);
+                }
+                // Convert to byte array
+                bytes = new byte[bytes2.size()];
+                for (int i = 0; i < bytes.length; i++) {
+                    bytes[i] = bytes2.get(i);
+                }
+                System.out.println(entry.getKey().getAsString() + " " + bitSet.toByteArray().length + " -> " + bytes2.size());
+                blocks.put(entry.getKey(), bytes);
+            }
+
+            BlockState biggest = null;
+            int biggestSize = 0;
+            for (Map.Entry<BlockState, byte[]> entry : blocks.entrySet()) {
+                if (entry.getValue().length > biggestSize) {
+                    biggest = entry.getKey();
+                    biggestSize = entry.getValue().length;
+                }
+            }
+            System.out.println("Biggest: " + biggest.getAsString() + " " + biggestSize);
+            blocks.remove(biggest);
+            out.writeNamedTag("BaseBlock", biggest.getAsString());
+
             out.writeLazyCompoundTag("Blocks", out2 -> {
-                for (Map.Entry<BlockState, BitSet> entry : blockMap.entrySet()) {
-                    out2.writeNamedTag(entry.getKey().getAsString(), entry.getValue().toByteArray());
+                for (Map.Entry<BlockState, byte[]> entry : blocks.entrySet()) {
+                    out2.writeNamedTag(entry.getKey().getAsString(), entry.getValue());
                 }
             });
         });