>>532296except its not really that hard, I could probably make that gas mask in ~30 minutes in wings3D and print it out really quick. don't glorify wintercuck.
OP, if you dont have experience with 3D modeling software, Wings3D is a good start, there's not much of a learning curve and it can export to .obj. And pepakura is free, (you can get the licence keys for free online) plus it's basically importing and spamming Ctrl+L to get it the right size.
make sure to use cardstock if its a large model.
