====== SprayBot ======

  * http://www.thingiverse.com/thing:65156
  * http://www.thingiverse.com/thing:190016
  * http://www.thingiverse.com/thing:6133
  * http://hackaday.com/2011/11/17/double-pendulum-spray-gives-this-graffiti-bot-some-style/
  * http://000000book.com/apps/22
  * http://000000book.com/apps
  * http://www.piccolo.cc/
  * http://www.harbaum.org/till/cnc/index.shtml