Think Star Trek replicators, except limited to plastic, play-doh, icing, or similar substances...
http://www.newscientisttech.com/article.ns?id=dn10922&feedId=online-news_rss20 Now you too can replicate injection-moulded kits and parts in the comfort of your own home. Hey, this could revolutionize making models table-top gaming ;)
Actually, it could revolutionize a lot of things. I'm still trying to come up with a clever idea...