I've no problem with printed bodies but a printed chassis? At least with a carbon fibre tub there's a lattice effect with the cross weave but where is the torsional strength in an adhesive based two dimensional layer structure?
Piratebay used to have a section for downloading 3d designs for you 3d printer.
Was a bit limited, they only had 3 designs, 2 dildos and a butt plug!
I think the 3d printing revolution is still a few years away!