I work in a prototype shop that does plastic injection molding, laser cutting, stamping, machining of castings we build in our pattern shop, wire EDM cutting, and short run machining. All of which needs to be inspected. We used to balloon our prints using highlighters which did not look at all professional. Now we use Bluebeam. It is much easier to update prints when there is an engineering change. We can also send our customers an electronic copy of the prints, eliminating some of the paper work.