A few guidelines for prototyping PCBs
Rapid prototyping in the electronic arena is a bit different than what it is for mechanical devices. There are no special machines to produce functional boards overnight. Prototype PCBs are built on production equipment. So it’s important to give manufactures a head start whether or not essential components and detailed specifications are available.
Design and assembly arrangements might include making sure the right stencils are on hand, preparing the necessary fixtures, creating the right thermal profile, conducting BGA (ball-grid array packaged components) studies, and if applicable, reviewing solder samples.