Cheapest 3D printer
My idea is to create a 3D printer using paper. There are two type of papers involved... thin and thick.
The thin paper is to print items like origami. You can print a 3D folding plane to a 3D Japanese dinosaurs origami. I'm sure all kids would love this.
Using thicker paper an architect or engineer can print parts of building with ease. These prnted parts can then be attached together. It is much cheaper than using the current printer technology.
This is my dream. Every house will have this soon.