A simple method to fabricate a large-sized polystyrene shell has been developed for use in future inertial confinement fusion experiments. The fabrication technique is based on the emulsion method. Important improvements to the previous technique are that the water phase of the emulsion is gelled by cooling and an oil phase is not stirred in a formation of a water/oil emulsion. In addition, the densities of water and oil phases are adjusted to remove the effect of gravity. The fabricated shells had diameters up to 6.2 mm.