As I'm always looking for solutions to non-existent problems, so I figured I'd spend a couple of hours in the shop to see if I could cobble up a couple of daylight developing tubes.
I came up with two prototypes. One with a screw on end cap, the other with a push on cap.
The tubes are basically the same:
5-3/4-inch length of 1-1/2-inch ABS pipe.
Push on end cap with hole drilled in the center for a rubber stopper.
Two disks made form 2mm nylon plastic with 1/2-inch fill/drain holes. (Sanded to minimize any reflections)
3-mm spacer cut from the 1-1/2 in ABS pipe
Push on end cap (painted black)
1-1/2" ABS threaded end cap and adapter
The disks are stacked (separated by the 3mm spacer) at one end, with the fill/drain holes on opposite sides creating the light trap. The ABS cap is glued over the two disks, sealing them in place.
Once the film loaded in the dark and the tube sealed, chemistry is added/drained at the stopper end.
$7.50 for the threaded cap assembly prototype
$5.00 for the push on cap assembly prototype
Both work equally fine.