Two interlocking parts to mechanically "bind" two disparate types of materials, e.g. M3D tough and M3D ABS-R. print as two models on dual (or more) extruder. Since this is designed to print in place, rather than print separately, I have not allowed for any gaps between the two models. From sample Promega mixed material prints of tough and ABSR, looks like this should be doable, but need to test.