STL and OpenSCAD design files for 3D printed microfluidic valves, pumps, and a 3-to-2 multiplexer/mixer as reported in "High density 3D printed microfluidic valves, pumps, and multiplexers," by Hua Gong, Adam T. Woolley, and Gregory P. Nordin submitted to the journal, "Lab on a Chip," on April 27, 2016.