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.
Via the comments.

Nice! The printing process was a time lapse though, how long does it actually take to create a ball of that size? Doesn’t matter really, low cost is always good in my book :P
WOW!
just one word: impressive
Very nice!
mindblowing and awesome work …are there any open source plans available for this great machine …i would like to make one for myself….can’t resist any more…