2D .dxf files in AutoCAD 2009 and lower, or .iges, .sat, are all that are required.
This will expedite the data transfer and quoting processes as well as the production lead times.
Include text with the following information:
- Part number
- Type and thickness of fixture material
- PCB dimensions and thickness
- Bottomside component height per layer
- Quantity ordering
- Any other pertinent information necessary for designing your fixture