RE: 3dp u-boat We played with it in my pool; it's a hoot to play with and drive around. Challenging to get it to dive quickly and yet not dive several feet in the same go.
OK, this is pretty awesome: http://www.thingiverse.com/thing:547847 http://www.thingiverse.com/thing:526074 http://www.thingiverse.com/thing:484736 Not only can 3d printers produce parts for our boats, they can produce other tools to make parts for our boats! That is two different designs for a 3d-printed lathe, suitable for turning plastic parts or getting that perfect finish on 3d printed parts. I wonder what other 3d printable machine tools are out there?
