The dip and dunk machines I've seen don't use reels. One of the big problem areas I was having with uneven development was with 120 film on the outer edges. It looked like if I wasn't quick and vigorous about getting the developer off the part of the film that came in contact with the reel it would slightly over develop in places. At least that's what it looked like to me. Eliminating the reel would solve that issue. It really didn't show up in 35mm negatives. I think it's because the image area is further away from the reel lip.
Originally Posted by yellowcatt