Conductive Ink looks like a production grade solution to minor circuit board design errors that would normally be solved by green wiring.
See also: electrical tape.
Flexible copper laminates look a little expensive but I also don't need 10 meters x 500 mm to make one replacement flex cable or some arbitrary new sensors.
These connectors are also pretty awesome.
Maker Faire Tokyo 2014 in 14 Minutes (Video)
1 hour ago