I have tried it all. Hold 10, 20, 30. Top off, cold mold, hot mold, cooler plastic, hotter plastic, slow shot, fast shot, and a mixture off all these trying to find the right combo. Just very frustrating. I think I spent another $200 going through material trying to get this right. As a Manufacturing Manager who has Design Engineers, Manufacturing Engineers, tool makers, programmers, CNC machines of all types, quality departments, anyway you get the point. I'm not at all happy with this mold and a very disappointed customer who really thinks Do-it is a great company. If I'm not doing something correct, then please explain the process steps to me because right now I'm getting a 50% or more scarp rate.