plastic. and the way it does that is it pulls plastic in from a spool, and squirts it through a little nozzle and it draws and then it lifts up a little bit and draws another picture in plastic on top of that picture, and layer by layer, it builds up the model. >> bree and a group of gear head friends got together and cobbled together a 3-d printer a couple of years ago, and now his brooklyn based company is at the hub o'testify 3-d maker revolution. >> when we got our prototype to work, we quit our jobs. our goal was to change the game and bring 3-d printing to people, so they could put them on their desktop and actually innovate personally. >> and just like the replicator in "star trek," maker bot's