Quote Originally Posted by frotog View Post
Temp drift and time variabilities due to manual fill and dumps are the two aspects of drum processing that will keep you from dialing in the perfect ra4 print - you'll be lucky to get within a cc point or two of neutral and once you get there making a duplicate will be well nigh impossible. If you have high standards for print quality and the ability to get there, drum or tray ra-4 processing will drive you nuts with the variability.
A temperature controlled drum is perfectly consistent (I have produced 15+ copies of a couple prints, no visible difference even in side-by-side comparison), especially if you do the proper process-temp prewash.

If a Jobo is too much $$$ and you're handy, there are lots of instructions on the web for making a bath from an aquarium pump, kettle element and PID controller for $100ish.