Papercraft projects tend to be based on 3D models from video games or custom-made art projects. The basic idea is to take a 3D model and flatten it out in software such as Dunreeb Cutout or Pepakura ...
3D printing tiny cars isn't new, but this creator's work lets you print a Revell- or Tamiya-style kit you can assemble yourself, just like the good old days. The site is kind of like Etsy for folks ...