Arhi tipped us about this amazing DIY high resolution 3D printer. It uses a projector to cure resin and, layer by layer, develop a 3D object. The developer wants to produce it as a low-cost, high-resolution 3D printer:

I have been dreaming about having a 3D Printer at home for many years, but the ones with good quality are not affordable and the low costs just deliver poor quality. Sounds crazy but I decided to build a high resolution 3D Printer by myself at home (people actually said that I was crazy and this was impossible). The funny thing I never saw this type of machines in real life, and still haven’t seen one besides the one I built. Now that I succeed building the first prototype, the target is to bring this low cost 3D Printer to every home, so we are developing the first affordable one with high resolution.