My normal development times are between ten and fifteen minutes. I don't think the five seconds it takes to fill the tank is going to give me negatives with more density at the bottom.
I can see stressing over dev times when it's short like 5 minutes or less, some of the dev times can be about 4 minutes or you have to adjust the dilution (HC-110 & Ifsol 3 come to mind) and pouring in a 2 reel (120) tank takes me 22 seconds with a 3 reel (120) tank it takes 36 seconds which is significant in a 5 minute window, that said... I've honestly never had an issue with uneven development even at fast times.
On the commercial dip-n-dunk E6 and C41 machines I have used, the time between baths was 15 seconds. C41 with a developing time of 3'15" was always the hardest one as the film was usually in the first developer for 3'35" which is getting close to a ½ stop push.
The thing is, if you wish to develop your dip-n-dunk machine, you don't have to alter much from what I can see, just ensure consistency and temperature stability.
One thing our commercial dip-n-dunk machines did have, were blasts of Nitrogen every 10 seconds for agitation.
Perhaps you can have a little lift of the film reel or holder by pulling it up say 4cm then it just drops back in and hits the bottom where there is a small glass marble on one side making the reel go sideways a bit, then immediately it starts pulling up 4cm again. This may be a way of getting some simple agitation happening.
Thanks for sharing. I look forward to seeing more.
hahahahhahha now I have seen it all!
So cool n a wonderful imagination.. that is waht we need more of in this world.
Thanks for the real world (no pun intended) examples. They are comforting.
No more slow than using a dip and dunk machine that has to lift a 120 film out of one tank and lower it into the next.
I never noticed any problems with the negatives produced like that.
A pre-soak has helped me w/air bubbles.
I remember I had to add a presoak when processing C41 with a Jobo CPE2 to prevent the occasional air bubble.