At TurboSquid.com you can search and download 3D models in 60 seconds. Printing cups is a parallel task, so only a few minutes are lost. You can also print in v

At TurboSquid.com you can search and download 3D models in 60 seconds. Printing cups is a parallel task, so only a few minutes are lost. You can also print in various colours, so painting is not necessary. You would, of course, have to buy the material spools, but those will come down in price and you can order them online quite quickly. If you make $30 per hour as a consultant and it takes 15 minutes to get to Walmart, 5 minutes to purchase the item, then those cups have cost ~$20 in your time, plus gas. You might like this article, showing the strength of mixed materials: http://www.extremetech.com/extreme/140084-nasa-3d-prints-rocket-parts-with-steel-not-plastic http://www.extremetech.com/extreme/140084-nasa-3d-prints-roc... And then there's this video of a printed gun in use: http://www.youtube.com/watch?v=wuDCW_Rn5JI http://www.youtube.com/watch?v=wuDCW_Rn5JI For a gun to be lethal, it need only successfully fire one bullet.