Why order a laser stencil?
why have a laser stencil? what advantages do you get from having one?
  


That's probably the wrong name. It's a solder-paste stencil that has been laser cut.



Figure 1. Application of surface-mount device solder paste to a PCB using a stencil. Source: SparkFun.



Figure 2. The finished result. Note the well defined edges. These will make placement easy and reflow a high chance of success. Source: Zavax.

The paste is applied through the stencil, the thickness of the stencil determining the quantity of paste applied. The stencil is then lifted and components placed.


  
  Why do some manufactures charge and some are free ...?
  


Different business models.