The differently colored fluorophores aid in performing fundamental multi-material MEW research, generating proof-of-concept designs. By printing with all four materials, a composite scaffold with all three CPP colors and a control PCL can be achieved. Figure shows how four different MEW jets have been printed in a sequential and cyclic manner (Figure ), achieving semiwoven fiber intersections across a scaffold. This demonstrates multi-material MEW fiber printing control beyond a series of walls printed sequentially, but not interlocked . While in this instance, all the fibers are made from PCL, the [n]CPP allows testing of multi-nozzle MEW concepts and generate G-code libraries while the technical issues surrounding processing different polymers, with differing melting points and thermal degradation profiles, are developed in parallel.