Topic: Printing with Sugru silicone goo
The guys at HYREL made a way to use Sugru (www.sugru.com) as media for 3D printing. They use one of these extruders (http://www.hyrel3d.com/emo-25/) at room temperature and just squirt the packets of Sugru into the metal cartridge. Apparently the extruder just squirts it out. I havf my reservations though, having worked with Sugru. It wants to cure within a half hour of contact with the air, so you couldn't print a very big part.
