Guy at the print shop in Dayton told me my line weights were backwards
I was picking up a set of 11x17 check plots last month and the guy behind the counter, Ray, who has been running that machine for 20 years, held one up and said "your heavy lines are on the wrong side of the drawing." He was right, I had been putting thick lines on the hidden edges and thin ones on the visible outline for who knows how long, and it made the whole sheet read flat. Nobody in my office caught it because we all look at screens now, but on paper it was obvious as day. Has anyone else had a print guy catch something you missed on screen?