feat(printer): 新增局域网发送3MF至A1打印机功能

a1_swap_mod_packer/printer.py

@@ -0,0 +1,42 @@
+"""打印机发送模块：通过局域网将 3MF 发送到 Bambu A1 并开始打印。"""
+
+from __future__ import annotations
+from pathlib import Path
+from dataclasses import dataclass
+
+@dataclass
+class PrinterConfig:
+    """打印机连接配置。"""
+    ip: str = ""              # 打印机 IP 地址
+    access_code: str = ""     # 局域网访问码
+    serial: str = ""          # 打印机序列号
+
+def send_to_printer(file_path: Path, config: PrinterConfig) -> bool:
+    """将 3MF 文件上传至打印机并开始打印。
+
+    Args:
+        file_path: 要发送的 3MF 文件路径
+        config: 打印机连接配置
+
+    Returns:
+        True 表示成功，False 表示失败
+
+    Raises:
+        ImportError: bambulabs_api 未安装
+        Exception: 连接或上传失败
+    """
+    # 延迟导入，避免在没有 bambulabs_api 时报错
+    from bambulabs_api import Printer as BambuPrinter
+    printer = BambuPrinter(config.ip, config.access_code, config.serial)
+    try:
+        printer.connect()
+        file_name = file_path.name
+        with open(file_path, "rb") as f:
+            import io
+            result = printer.upload_file(io.BytesIO(f.read()), file_name)
+        if "226" not in result:
+            raise RuntimeError(f"上传文件失败: {result}")
+        printer.start_print(file_name, plate_number=1)
+        return True
+    finally:
+        printer.disconnect()