Spacetime Folder is a legendary gadget which allows you to teleport during battle. Requires the Physics Research legendary ingredient, obtained from killing high tier animals like Gert Berg Shirks or Dueven Lyff Brohs in the Tundra.
To get recipe, beat the boss E.M.G. Once you did that, the quest leads you to defeat a boss called the I.H.O. And you get the recipe for the Spacetime Folder and 4 other useful items.