Re: 3D Printing of Sailboats
The company I used to work for made titanium parts from 3d CAD drawings. The largest I worked on was a exhaust manifold for a 450hp Diesel engine, I think about 24"x30"x6" but I can't remember the specs to be honest. It took about 12 hours on a high speed large platform sintering machine.
I could easily see a very large machine with multiple laser printing heads working on a large project like a boat, and do it in a reasonable amount of time. I don't think the technology is there yet, and I don't think it will be in the very near future, but I do think it will be coming eventually.