While an injection mold design is on paper, you really don’t know if it will look like what you are considering. Using up material to make a design without having a simulated rendering is an unnecessary risk that can be very costly and time-consuming.
By working with a simulation first, you will be able to get a very accurate idea of what it will look like once the design is moved to the prototype. It also gives you a chance to look for potential issues before you put materials into it.
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