The usecase for Unfolder or Pepkura isn't 3D printing. They're targeted at paper crafting. You print the unfolded file onto paper, cut, fold, and glue to create a 3D object. Something like these samples <https://duckduckgo.com/?t=ffab&q=paper%20craft%20models&ia=i...>
I'm assuming they meant a 2D printer, which you need to be able to use this.