Stencils are a series of holes cut into a thin sheet of cardboard, plastic or metal. This sheet is then used as a template to replicate that exact shape time and time again.
If you find yourself in the Plastic Injection Moulding Industry and you struggle to understand procedures and principles involved, then this is the place to go. Here you can get a direct link to books that explain in great depth the WHY we do things in plastics, and the books go in greater detail explaining what is happening, including DieSetting and Troubleshooting