3D printing is going to have massive use cases in the future. Arthur C. Clark's book "Profiles of the Future: An Inquiry into the Limits of the Possible" actually went into a lot of details about 3D printing and we are yet to achieve most of the things that was described more than half a century ago. 

Having these tools open sourced can help more people explore these technologies at a lower barrier for entry that could result in a lot more development in the field.