Wire bending

http://summit.oshwa.org/diwire-a-3d-cnc-wire-bender/

http://blog.ponoko.com/2012/09/30/d-i-wire-bender-version-2-on-show/

can bend steel exactly

http://makeprojects.com/Project/DIWire-Bender/2574/1#.UGguyKQoTqF

http://code.google.com/p/diwire/