Alexandria Lafci – https://twitter.com/laughsee – and Brett Hagler – https://twitter.com/bretthagler – are cofounders of New Story Charity – https://newstorycharity.org/
New Story Charity builds homes and communities in the developing world. They were part of the Summer 2015 YC batch.
They just 3d printed their first home in Austin, Texas. You can read more at – https://3DHome.org