How to 3D Print Multimaterial Objects Using a Single-Nozzle 3D Printer

Let's say you can only afford a single-nozzle FDM 3D printer, but you want to print a multimaterial part. You can stop at each material transition point in the process and swap out the spools, but this pause-and-resume approach comes with challenges; most notably you may need to purge the tip to flush out the first color before adding the second, for instance if the color switch is extreme. A research collaboration between students from Meiji University, Osaka University and Texas A&M...