This is a mini popcorn machine. You can coock other foods too. Use to fry corn. Should be made of metal. 3d printable stl file also attached. But it's not suitable for 3d printing. Iron casting will be the best making process for this coockware. STEP file format attached. Should use high heat proof rubber washer to keep pressure inside. You can use safety valve to release over pressure.

Custom size and design possible. Please contact with me for more details. Thanks,Mahbub