Whoa nellie.....! Are you talking about 3" or 3'5" Essential Ripper mold? If so, those really are not formatted for twin injection. Never were. You can get reasonable split colors by injecting with a dud color, then removing the top two baits, right and left top ones and leave the rest of the injected dud color as a stopper, then inject with the twin injector, slowly. If you do not stop the plastic by leaving the lower portions in the mold, mixing will be your life. I have that mold, and it sits with the dud color "stopper" in it from the first shot done using it. The mold is fine but it was never meant to do a full mold of laminates like the Slick Shiner that has individual injection ports to allow for laminates.