In the rapid prototyping service, the 3D data and technical drawing sent by the customer are delivered as a casting within 1 to 4 weeks, depending on part geometry. Advanced 3D printers are used. The method is presented as an alternative to the high cost of machining samples from solid material, so the first samples can be designed for casting from the start. Lead times before series production are brought forward, and low quantities are made to the requested measurements without giving up geometry or size and without a high mold investment. Many small parts can be produced in one work package, and design errors can be seen before series production.