Just say no (politely) to drawings.
Some shops spend hundreds of hours each year redrawing parts that have been submitted to them as PDF or paper drawings. Where did these PDFs come from? Most of these drawings were generated based on models resident in their customers’ CAD systems. When shops make a point of consistently and politely asking the customer for the CAD file, the savings resulting from elimination of hours spent duplicating the model can be tens of thousands of dollars.