As they can now already print bearings with working ball races and even with the grease in them, it may only be a matter of time before someone with a big enough printer can print a whole car, except for the electronics of course.
The great thing about 3D printing with multiple materials is that you no longer have to design for manufacture. A 3D printed engine, if it were possible, could have no cylinder head, no sump, no bolts, just printed with all the captive parts inside one solid shell.
There would then no longer be the manufacturing defects caused by poor production line management, any failure would be entirely down to the design of the part, as each one would be identical.
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