A few years ago I wrote the "worst 3D Printer". Basically, it takes a 3D model (VRML) and slices it to bitmaps, which can be arranged on paper and printed, then manually cut out and glued together. As you can imagine, just doing a small print could take 500 layers, so it could take a day to assemble (hence "worst"). 
To be more useful, I want to rewrite the old code to properly support STL format. I attempted this once, but had trouble with the normals and getting the lines to connect correctly. So a rewrite would be good.
 Actually, one nice feature of this is to just cut out the images as rectangles, glue along one side, and use as a flipbook of the model.
This project is one of its kind!