Autodesk CEO Carl Bass says that one of the really cool things about this project is that it will happen in public - not behind closed doors in a lab. Doing this project in public makes it more complicated and risky which increases the chances of learning new things.
You can see the novel printing process that MX3D has developed below. They have a multi-axis industrial robot hooked up to a robot via custom software.
Before MX3D developed their metal printing process, they perfected a resin-based method. This super fast curing resin neutralizes the effect of gravity during the printing process - the structure keeps it shape without drooping or sagging.
This may take a couple years to complete but should be fun to watch.
The finished bridge may end up looking like this model made with Dreamcatcher. The organic, tree-like structure fits nicely into the natural environment of a park.