What does a Dungeon Artificer do?

[alimantando]

I do not get a picture in my mind about the role of the Dungeon Artificer.
Could you give me some input?

What does he do? Whats his cool move?
How should the player let him act, to get most fun?
Maybe: What Thingies has the GM to provide so that the Dungen Artificers player doesn't get bored.