diff --git a/E3S1PROFROKBYTT_orcaslicer_thumbnail.py b/E3S1PROFROKBYTT_orcaslicer_thumbnail.py
index 6658b7d..2c9f132 100644
--- a/E3S1PROFROKBYTT_orcaslicer_thumbnail.py
+++ b/E3S1PROFROKBYTT_orcaslicer_thumbnail.py
@@ -7,7 +7,9 @@
 # ------------------------------------------------------------------------------
 
 import sys
-import os
+import base64
+from PIL import Image
+from io import BytesIO
 
 # Get the g-code source file name
 sourceFile = sys.argv[1]
@@ -16,23 +18,78 @@ sourceFile = sys.argv[1]
 with open(sourceFile, "r") as f:
     lines = f.readlines()
 
-new_lines = []
-remove_lines = False
-
-for line in lines:
+# Find the index of the line containing '; HEADER_BLOCK_START'
+header_start = None
+for i, line in enumerate(lines):
     if line.strip() == '; HEADER_BLOCK_START':
-        remove_lines = True
-    elif line.strip() == '; THUMBNAIL_BLOCK_START':
-        remove_lines = False
-    elif not remove_lines:
-        new_lines.append(line)
+        header_start = i
+        break
 
-try:
-    with open(sourceFile, "w+") as of:
-        of.write(''.join(new_lines))
-except Exception as e:
-    print(f'Error writing output file: {str(e)}')
-    input()
-finally:
-    of.close()
-    f.close()
\ No newline at end of file
+# Find the index of the line containing '; THUMBNAIL_BLOCK_START'
+thumbnail_start = None
+for i, line in enumerate(lines):
+    if line.strip() == '; THUMBNAIL_BLOCK_START':
+        thumbnail_start = i
+        break
+
+# Ensure both start markers were found for header and thumbnail
+if header_start is not None and thumbnail_start is not None:
+    # Remove the lines between '; HEADER_BLOCK_START' and '; THUMBNAIL_BLOCK_START' including the marker lines
+    del lines[header_start:thumbnail_start+1]
+
+    # Find the index of the line containing '; thumbnail begin' or a similar line
+    index_begin = None
+    for i, line in enumerate(lines):
+        if '; thumbnail begin' in line:
+            index_begin = i
+            break
+
+    # Find the index of the line containing '; thumbnail end'
+    index_end = None
+    for i, line in enumerate(lines[index_begin:], start=index_begin):
+        if line.strip() == '; thumbnail end':
+            index_end = i
+            break
+
+    # Ensure both start and end markers were found for thumbnail
+    if index_begin is not None and index_end is not None:
+        # Extract the original PNG data from the lines between '; thumbnail begin' and '; thumbnail end'
+        original_png_data = "".join(lines[index_begin + 1:index_end])
+
+        # Remove "; " from the extracted PNG data
+        original_png_data = original_png_data.replace("; ", "")
+
+        try:
+            # Decode the original PNG data
+            png_data_bytes = base64.b64decode(original_png_data)
+            image = Image.open(BytesIO(png_data_bytes))
+            image = image.convert("RGB")  # Convert to RGB mode
+
+            # Encode the image as JPEG
+            buffer = BytesIO()
+            image.save(buffer, format="JPEG")
+            image_jpg_data = buffer.getvalue()
+
+            # Base64 encode the JPEG data
+            image_jpg_base64 = base64.b64encode(image_jpg_data).decode('utf-8')
+
+            # Calculate the size of the JPEG data in bytes
+            jpg_data_size = len(image_jpg_base64)
+
+            # Replace the size in the '; thumbnail begin' line
+            lines[index_begin] = f'; thumbnail begin 250x250 {jpg_data_size}\n'
+
+            # Calculate the maximum line length
+            max_line_length = 79 - len("; ")
+
+            # Prepare the injected JPEG data with each line on a new line
+            injected_jpg_data = ["; " + image_jpg_base64[i:i + max_line_length] for i in range(0, len(image_jpg_base64), max_line_length)]
+
+            # Insert the new formatted JPEG data into the original lines
+            lines[index_begin + 1:index_end] = [line + "\n" for line in injected_jpg_data]
+
+            # Write the modified content back to the original file
+            with open(sourceFile, "w") as f:
+                f.writelines(lines)
+        except Exception as e:
+            sys.exit(1)