[T-BOT]

i think most designers know the file platforms printers work with. Vector files for example.

It depends on the art type and what process the printer will be using and what files they work with the most.

In general, AI, PDF, EPS, COREL Draw (my favorite)...... are common file types for printers.

 

[T-BOT]

(like if the designer is using a Mac and your printer is using all PCs)

good point.