Giant 3D printers for making boats, bridges, buildings and rockets

Boat building is a long-winded and tedious business, even when what is going down the slipway is a small craft made from modern materials such as fibreglass, rather than something nailed together out of planks of wood. Construct a mould. Build up layers of resin and glass fibre inside that mould. Extract the completed structure and finish it.
Read more: https://www.economist.com/science-and-technology/2019/11/14/giant-3d-printers-for-making-boats-bridges-buildings-and-rockets?source=Snapzu