Here's how you make a 3D printing gun using Lego
 

What do you do if you want to 3D print in any direction, but can't buy a pre-made pen like the 3Doodler? If you're Vimal Patel, you build your own. He melded a hot glue gun with a powered Lego mechanism (really, Technic) to extrude filament in any ax...

http://www.engadget.com/2015/03/16/l...=rss_truncated