this will let you know how well tuned your dual extruders are align the two parts together so that they fit perfectly, if you have a centering option that should work for it, and lay it on the bed however you want to print it. change the extruders for the stl files (obviously) and print. side note you may want to scale it up its a bit small but god for a quick test however for a better test id scale it up id recommend up to around 2