I’m actually one of the authors. The main thing we are trying to address in microfluidics is he feasibility, which is why we have been focusing on 3D printing as opposed to traditional clean room fabrication techniques because we can make a new design and see if it works in all of like 15 minutes whereas with clean room fabrication it would take closer to weeks. As far as the connections, we talk about those in some of our earlier papers referenced in the article, but it is actually quite simple. Instead of traditional connectors, we just include roughly 1mm diameter output holes where we can epoxy in tubing that has the same width.