This mecha paper model is Z-01 Lancelot, an experimental Knightmare Frame developed by Lloyd Asplund and the Military Engineering Corps, based on the Japanese anime series Code Geass, the papercraft is created by Okami/Kaguya.
Z-01 Lancelot is the first seventh generation Knightmare Frame ever fielded. The Lancelot outperforms most other models thanks to the heavy amount of Sakuradite scattered throughout its frame as well as in its Yggdrasil Drive, the Core Luminous. As it is still in development, the Lancelot lacks an ejection seat. Its pilot is Suzaku Kururugi.
You can download this paper model template here: Code Geass - Z-01 Lancelot Free Mecha Paper Model Download [DropBox] [Gavitex]