plastic. and the way it does that, it pulls plastic in from a spool and squirts it through a nozzle. it draws another picture in plastic on top of that picture and layer by layer it builds up the model. >> he's a hacker, teacher, tinkerer and thinker. he and a group of gear head friends got together and cobbled together a 3d printer a couple of years ago and now his brooklyn based company is at the hub of the 3d maker revolution. >> we got our prototype to work, we quit our jobs and started makerbot. to actually innovate personally. interact with the machine. >> and just like the replicator in "star trek," makerbot's replicator 2 is turning people