The Voltera uses conductive ink to rapidly print prototypes (45 minutes to an hour for a small board.)
They're targeting hobbyists and makers in the short term - their Kickstarter campaign over-funded by a factor of 4. Check out the animated gif below for a sped-up view of the printing process.
Here's a link to a video that more thorougly describes the product. https://d2pq0u4uni88oo.cloudfront.net/projects/1607708/video-496130-h264_high.mp4