The original model for vacuum casting is generally created using the stereolithography method. From this model, a primary mold of silicone is created and filled in the vacuum chamber with liquid polyurethane casting resin (PUR). The vacuum prevents bubbles and shrink holes even in complex molded parts. After hardening, the service of the casting is finished. Given the numerous available polyurethanes and ureols (PU hard foam), many conventional production plastics (injection molding) can be simulated. Whether rubber-soft, last, semi-rigid or ABS rigid, there are vacuum casting resins for a very wide range of material requirements and priorities. Two component parts (hard/soft) or inserts are also possible. The dimensional precision of molded parts in vacuum casting is �± 0.1 mm or 0.2%. In vacuum casting, the maximum yield from one silicone mold is approximately 20 molded parts. There are no demolding chamfers and added material to compensate for shrinkage in vacuum casting.