A longtime friend of mine has significant pieces of a replicator functioning in his lab right now. He’s no mad scientist but a respected engineer who is known for his broad technical interests. Right now he can’t make you a mug of Earl Grey (hot), but he can lay down in nanoseconds trillions of atoms of any abundant element, placing those atoms not just in perfect rows, but also placing them in intricate patterns with other atoms to create familiar combinations as well as new materials the world has never seen before.
He is already creating new materials with unique properties that couldn’t exist before simply because no materials have ever been built by men or women to such precision.