MakerBot is an affordable, open source 3D printer. It makes almost anything up to 4"x4"x6". Build your own MakerBot and it makes things for you. MakerBots print with ABS plastic. It's your own little factory.
And from their blog (4 June, 2010):
A MakerBot Self Replicates!!!!
Wow, just wow! Christian Arnø has made a MakerBot with a MakerBot and has achieved MakerBot self replication!!! SO MUCH WIN!