The Japanese 46 cm/45 Type 94 naval gun was a 46 cm naval rifle, the largest ever mounted on a warship. Only two ships carried them, the Imperial Japanese Navy's World War II super-battleships the Musashi and Yamato. They were designated as a much smaller 40 cm gun in an effort to hide their true size.
There are nine sets of textures in this model composed of the base color, normal, height, metallic, and roughness maps.
The object can be 3d printed, but it wasn't made with that purpose in mind.