A company called Apis Cor has 3D printed a (tiny) house in 24 hours for $10,000, which comes out to about $275/m2.
Reconstructing Buckingham Palace at 77,000 m2 this way would cost only about $21 million. According to a 2010 estimate in The Guardian: "you could build a new energy-efficient replica of the palace for a knock-down £320m", which translates to $552 million.
So: 3D printing the palace would save over a HALF BILLION DOLLARS! Muahahaha (pinkies up!).
Video of the building process.
(Score: 3, Insightful) by Dunbal on Monday April 24 2017, @08:23PM
But I'm pretty sure that honeycombing concrete doesn't make up for the fact that there's no rebar in the walls in an earthquake zone...