3D printing is going to be more about individual parts, but those parts can be put together to make something bigger. I don't think you can print metal though, and if you could I bet it would be super expensive.
Its pretty cool that we can do this in any way. I am excited to see how the technology develops over the next while.
It does look like a toy bike or something. In fact, i was expecting this thread to be about toy bikes and not full-size ones.
Because of the accuracy of 3d printing they can have very consistent structures. So shapes can be printed inside of the metal objects to increase their rigidity. At least in terms of how much pressure it can take pushed against it.
The complications is when you need parts that are are strong as forged metal. Printed parts tend to have the consistency of cast metal. Kind of powdery and can tear when high levels of stress are placed through the object.
Maybe there is a way to heat forge the metals made from 3D printing.
As for hot press forging.. Not sure if 3d printing can match the power of that
Some things are probably best kept for old school methods
But certain parts that dont require as much tensile strength can likely be printed. Anything that is made from cnc machined non forged aluminum (lots of parts) can just as well be printed. And the printing machines are just as expensive as cnc machines if not cheaper.