This week's gadget is the ONO $99 3D printer that uses your smartphone to act as the platform to print a 3D resin image. The smartphone is providing the visible light to harden the resin as it's printed. That means 3D objects can be created layer by layer using your smartphone’s screen as light source. A rough estimate of the maximum size of the 3-D build is 4.72" X 2.5" X 2".
How fast is it? It depends on the brightness of the phone, but they gave as an example an approximately 2" high 3D object could be printed in 2.5 hours, or 2 hours with a brighter display like some iPhones. Also you should be aware that print precision depends on the resolution and the contrast of your smartphone screen.
Are people interested in this device? They raised almost $3 million between Kickstarter pledges and BackerKit add-ons. As of March 23, 2017 they started delivering finished ONO printer to its 16,000+ backers. Now ONO is available for purchase at $99 USD, while their special resins retail for $15. All products are available directly online through the store at ono3d.net, and selected resellers worldwide. The printer supports most Android and Apple smartphones running Android 4.4+ or iOS 9+.
It seems it started on Kickstarter as the OLO 3D Printer.