The drum did get a bit smelly, but I rinsed it out well and let it air. No harm done. Caffenol stinks. No two ways around it.
If you think Caffenol stinks, you should try the red wine variation. (same amounts of soda, vitamin C and old brown if you use it, but with the coffee/water portion replaced by that bottle of wine your aunt gave you. ) Stinky, and somewhat slower, but quite effective. I recently printed about six paper negatives that were intended for a Caffenol show and they look almost identical.
Tom, on Point Pelee, Canada
Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...