This papercraft is a life size Raknis Nekros Helmet, an alternative helmet for Nekros, based on the free-to-play cooperative third-person shooter video game Warframe, the paper model is created by Sinner. The size of finished model is about 320 (H) x 323 (W) x 205 (D) mm.
To equip your newly bought or crafted helmet, go into the "Arsenal" page, then click on Nekros' "Appearance" tab. The helmet will be the first item in the section labeled "Physique".
You may get this papercraft template here: Warframe - Raknis Nekros Helmet Papercraft Free Template Download