Silicone Mould, Vacuum Casting [Feb 20,2017]
This is a two stage process: First, a master prototype is made by one of the above processes. This master is then used to make a silicone rubber mold. Once the molds are made, liquid urethane rubber is placed inside the mold and allowed to cure. Once cured, you have a urethane copy of your master prototype.
The process allows the creation of a larger number of prototypes (up to about a dozen, possibly more) rapidly and accurately. Additionally, urethane castings are typically more durable than any of the master prototypes, and can be made faster and for a much lower cost.