Newbie to CNC Zone and injection molding. Need some help figuring out what a typical vent size is. I'm using Morgan-Press injector rated for 12 tons, and I'll be using low density polyethylene. It's a very small mold compared to some I've seen, it's got about 18 square inches of surface area on the inside including the gates and the sprue, and it makes 4 caps at a time. Any help anyone can give me would be awesome.