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A custom carbon fiber Lamborghini body for a go kart, that used to be golf cart.

It would have to be a big shelf, but A life size Master chief or Ironman would do. If it was wearable that would be even more awesome. I would wear it to Halloween parties, maybe even for the kids at...

I don't know about practical but making parts for my motorcycle would be at the top of my list, then of course little odds and ends for the house to make the wife happy.

One of the most popular, I would say Ironman Mk 42 and Iron Patriot "War Hammer". I think The new Robocop would be awesome as well.

Making the 3d models would have to be the hardest thing to deal with, if not the most time consuming.

I would say the use of carbon fiber needs to be expanded. Not just a filament, but the ability to be able to print in either twill weave or 2x2 pattern. I suppose this may be available in the future.

What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?
The most interesting thing that is being done with 3d printers is not desktop trinkets knick...