A method of fabricating a metal cup includes a tool having an interior profile of a predetermined shape, the tool having a body forming an inner area; placing a metal sleeve within the inner area of the tool; securing the tool in a closed position such that the metal sleeve is unremovable; applying internal pressure within the inner area and within an inside of the sleeve such that the internal pressure exceeds a yield point of a material comprising the metal sleeve, the metal sleeve deforms into the interior profile; opening the body of the tool; and removing the metal sleeve from the tool in the open position; the metal sleeve maintains a deformed shape having an exterior profile that matches the interior profile of the tool.