diff --git a/app.py b/app.py
index 3ff935a..c2c87ae 100644
--- a/app.py
+++ b/app.py
@@ -31,7 +31,6 @@ app.logger.setLevel(logging.DEBUG)
 
 # Create a queue to hold the files for processing
 file_queue = queue.Queue()
-
 image_queue = queue.Queue()
 
 lock = threading.Lock()
@@ -106,7 +105,7 @@ def print_address_label(image, pdf_path):
 
 def save_images(images, pdf_path):
     uuid = str(int(time.time()))
-    for i,image in enumerate(images):
+    for i, image in enumerate(images):
         if 'address' in pdf_path.lower():
             image.save(os.path.join(IMAGE_FOLDER, f"address_label_{uuid}_{i}.png"), "PNG")
         elif 'packing' in pdf_path.lower():
@@ -118,20 +117,18 @@ def save_images(images, pdf_path):
 # Worker thread that processes files from the queue
 def file_worker():
     while True:
-        # Wait until a file is available in the queue
         file_path = file_queue.get()
         if file_path is None:  # Shutdown signal
             break
-        # Process the file (convert and print)
         app.logger.info(f"Processing file: {file_path}")
         images = convert_pdf_to_images(file_path)
         if images:
             save_images(images, file_path)
         else:
             app.logger.error(f"Failed to convert PDF to images: {file_path}")
-        # Signal that the task is done
         file_queue.task_done()
 
+# Printer worker
 def printer_worker():
     while True:
         image, path = image_queue.get()
@@ -141,10 +138,24 @@ def printer_worker():
             print_address_label(image, path)
         image_queue.task_done()
 
-# Start the worker thread
+# Variable to track the printer worker thread
+printer_worker_thread = None
+
+# Ensure only one printer worker is created
+def start_printer_worker():
+    global printer_worker_thread
+    if printer_worker_thread is None or not printer_worker_thread.is_alive():
+        app.logger.info("Starting printer worker thread.")
+        printer_worker_thread = threading.Thread(target=printer_worker, daemon=True)
+        printer_worker_thread.start()
+    else:
+        app.logger.info("Printer worker thread already running.")
+
+# Start the file worker thread
 threading.Thread(target=file_worker, daemon=True).start()
-# Start the printer worker thread
-threading.Thread(target=printer_worker, daemon=True).start()
+
+# Start the printer worker only once
+start_printer_worker()
 
 @app.route('/upload', methods=['POST'])
 def upload_file():